Bump build_runner from 2.2.0 to 2.2.1

Created by: dependabot[bot]

Bumps build_runner from 2.2.0 to 2.2.1.

Commits

• 07d1aaf Support latest package:analyzer (#3368)
• 62cef9f Fix stuck in LruCache after updating items (#3365)
• 9d607d5 Migrate to latest mono_repo, use pubspec feature (#3363)
• 231750a Make package configuration loading use the correct function. (#3355)
• fcff629 Avoid deprecated analyzer APIs (#3351)
• 2dcbb05 stop ignoring no_leading_underscores_for_library_prefixes in build scripts, c...
• 7eb3087 Use a standalone process to compile DDC dart_sdk.js files (#3348)
• be57ae7 migrate off of library.parts (#3342)
• 8fb894f Remove non-existing 3.0.2 version from changelog (#3341)
• f1a7de8 run dart2js through 'dart compile js' instead of its snapshot (#3338)
• Additional commits viewable in compare view

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