chore(deps): update node in CI builds to 14.19.0

[dbjorge]

Details

This PR bumps the version of Node we use in CI builds on both GitHub Actions and Azure DevOps to the latest v14 (14.19.0).

This is primarily in the hopes of resolving an issue we've seen in a few recent PR builds for dependabot PRs where builds fail in webpack with an error that looks like this:

Running "concurrent:webpack-all" (concurrent) task

    Running "exec:webpack-prod" (exec) task
    >> internal/child_process/serialization.js:70
    >>       yield deserializer.readValue();
    >>                          ^
    >> 
    >> Error: Unable to deserialize cloned data.
    >>     at parseChannelMessages (internal/child_process/serialization.js:70:26)
    >>     at parseChannelMessages.next (<anonymous>)
    >>     at Pipe.channel.onread (internal/child_process.js:599:18)
    >> Exited with code: 1.
    >> Error executing child process: Error: Process exited with code 1.

This symptom is similar to the one resolved by nodejs/node#38728, which is included in 14.17.4

Motivation

• Keep deps up to date
• Attempt to avoid an error blocking PR builds (chore(deps-dev): bump sass from 1.49.0 to 1.49.7 #5134, chore(deps-dev): bump core-js-bundle from 3.20.3 to 3.21.0 #5135, chore(deps-dev): bump css-loader from 6.5.1 to 6.6.0 #5136)

Context

n/a

Pull request checklist

• [n/a] Addresses an existing issue: #0000
• Ran yarn fastpass
• [n/a] Added/updated relevant unit test(s) (and ran yarn test)
• [n/a] Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• PR title AND final merge commit title both start with a semantic tag (fix:, chore:, feat(feature-name):, refactor:). See CONTRIBUTING.md.
• [n/a] (UI changes only) Added screenshots/GIFs to description above
• [n/a] (UI changes only) Verified usability with NVDA/JAWS