📦 Release web-features@2.10.0

[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
- 11 features
- 80.8% coverage of BCD

## What's Changed
* Update relative-color feature keys by @jamesnw in https://github.com/web-platform-dx/web-features/pull/2311
* Move download and ping out of draft by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2347
* Add ServiceWorker by @autonome in https://github.com/web-platform-dx/web-features/pull/2357
* Add a feature for Digital goods by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2359
* Add UI Events as features, update existing events by @autonome in https://github.com/web-platform-dx/web-features/pull/2285
* Fix typo in `input-button` description by @ddbeck in https://github.com/web-platform-dx/web-features/pull/2366
* Bump @mdn/browser-compat-data from 5.6.19 to 5.6.20 by @dependabot in https://github.com/web-platform-dx/web-features/pull/2372
* Add a key to server-timing by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2374
* Add keys to websockets by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2375
* Add a Beacon feature by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2361
* Move srcset out of draft by @Elchi3 in https://github.com/web-platform-dx/web-features/pull/2349


**Full Changelog**: https://github.com/web-platform-dx/web-features/compare/v2.9.0...v2.10.0

[ddbeck]

v2.9.0

{
  "features": 910,
  "compatKeys": 11881,
  "compatKeysUnmapped": 3162,
  "compatCoverage": 0.7930182886130023,
  "compatKeysPerFeatureMean": 13.056043956043956,
  "compatKeysPerFeatureMedian": 4,
  "compatKeysPerFeatureMode": 1,
  "currentBurndownSize": 1706
}

v2.10.0

{
  "features": 921,
  "compatKeys": 12107,
  "compatKeysUnmapped": 2944,
  "compatCoverage": 0.8076717811874583,
  "compatKeysPerFeatureMean": 13.145494028230184,
  "compatKeysPerFeatureMedian": 4,
  "compatKeysPerFeatureMode": 1,
  "currentBurndownSize": 1488
}

[szepeviktor]

80.8% coverage of BCD

Will we go home at 100%? 🙃