📦 Release web-features@2.7.0

[github-actions]

This is a generated release pull request. Don't merge if you're not ready to carry out the release.

## What's New
- 63 features
- 77.7% coverage of BCD

## What's Changed
* Adds background features and updates keys on existing background features by @vwallen in https://github.com/web-platform-dx/web-features/pull/2206
* Add more keys to referrer-policy by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2224
* Add Sourcemap header by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2184
* Add user agent client hints by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2179
* Uncomment keys excluded for non-real values, now fixed by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2226
* `ink`: drop deprecated key by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2227
* Add page visibility, transition and lifecycle features by @autonome in https://github.com/web-platform-dx/web-features/pull/2012
* Selectors- Add baseline high by @jamesnw in https://github.com/web-platform-dx/web-features/pull/2171
* Selectors - and indexed pseudo classes by @jamesnw in https://github.com/web-platform-dx/web-features/pull/2168
* Add initial CSS pseudoclasses by @jamesnw in https://github.com/web-platform-dx/web-features/pull/2229
* Input (continued) by @autonome in https://github.com/web-platform-dx/web-features/pull/2044
* Adds features from CSS 2 (`@charset`, float & clear, vertical-align) by @vwallen in https://github.com/web-platform-dx/web-features/pull/2216
* Bump @mdn/browser-compat-data from 5.6.15 to 5.6.16 by @dependabot in https://github.com/web-platform-dx/web-features/pull/2257
* Add a key to functions feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2264
* Add a key to Map by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2260
* Add missing code formatting to navigator description by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2265
* Add a key to set feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2266
* Add Upgrade insecure requests by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2174
* Add more keys to Promise by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2259
* Add more keys to classes feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2267
* Add a key to weak references by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2262
* Add a key to SharedArrayBuffer and Atomics by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2261
* Add Window and Window Management API by @autonome in https://github.com/web-platform-dx/web-features/pull/2010
* Add HTTP authentication by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2238
* Add a data urls feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2234
* Add HSTS by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2239
* Remove discouraged `FontFaceSet()` from `font-loading` by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2270
* Add <fencedframe> by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2242
* Add zstd compression by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2241
* Selectors- add baseline false features by @jamesnw in https://github.com/web-platform-dx/web-features/pull/2169
* Add Local fonts by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2243
* Add Mixed content by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2235
* Add a JavaScript object feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2269
* Add error-cause feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2263
* Add CORS by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2237
* Add brotli by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2240
* Adds keys to SVG feature by @vwallen in https://github.com/web-platform-dx/web-features/pull/2253
* Add a Clearing site data feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2084
* Add WebRTC by @autonome in https://github.com/web-platform-dx/web-features/pull/2232
* Add key to `selection-api` by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2278
* Adds keys to font-variant-emoji by @vwallen in https://github.com/web-platform-dx/web-features/pull/2281
* Bump @mdn/browser-compat-data from 5.6.16 to 5.6.17 by @dependabot in https://github.com/web-platform-dx/web-features/pull/2284
* Move `toggle` event from `popover` to `details` by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2287
* Add alerts, new window keys by @autonome in https://github.com/web-platform-dx/web-features/pull/2273
* Add Cookies by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2236
* Add requestIdleCallback feature by @autonome in https://github.com/web-platform-dx/web-features/pull/2274
* Add more push API keys by @autonome in https://github.com/web-platform-dx/web-features/pull/2275


**Full Changelog**: https://github.com/web-platform-dx/web-features/compare/v2.6.1...v2.7.0

[ddbeck]

v2.6.1 stats:

{
  "features": 828,
  "compatKeys": 10604,
  "compatCoverage": 0.7097724230254351,
  "compatKeysPerFeatureMean": 12.806763285024154,
  "compatKeysPerFeatureMedian": 4,
  "compatKeysPerFeatureMode": 1
}

v2.7.0 stats:

{
  "features": 891,
  "compatKeys": 11622,
  "compatKeysUnmapped": 3409,
  "compatCoverage": 0.7768197313013836,
  "compatKeysPerFeatureMean": 13.043771043771043,
  "compatKeysPerFeatureMedian": 4,
  "compatKeysPerFeatureMode": 1,
  "currentBurndownSize": 1953
}