Bump @iobroker/adapter-core from 2.6.8 to 3.0.4

Bumps [@iobroker/adapter-core](https://github.com/ioBroker/adapter-core) from 2.6.8 to 3.0.4.
- [Release notes](https://github.com/ioBroker/adapter-core/releases)
- [Commits](ioBroker/adapter-core@v2.6.8...v3.0.4)

---
updated-dependencies:
- dependency-name: "@iobroker/adapter-core"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -37,7 +37,7 @@
     "libsodium-wrappers": "^0.7.13",
     "create-stream-server": "^0.1.1",
     "mqtt-connection": "^4.1.0",
-    "@iobroker/adapter-core": "^2.6.8"
+    "@iobroker/adapter-core": "^3.0.4"
   },
   "devDependencies": {
     "@alcalzone/release-script": "^3.7.0",