Bump build_runner from 2.4.6 to 2.4.7

Bumps build_runner from 2.4.6 to 2.4.7.

Release notes

Sourced from build_runner's releases.

package:build_runner v2.4.7

• Fix broken link in README.md.
• Bump the min sdk to 3.0.0.
• Add a warning to the doctor command if a build.yml file is found (instead of a build.yaml file).

Commits

• df76f89 add a warning if a build.yml file is found in the doctor command (#3616)
• 7f5b103 [web_compilers] Add support for js_interop_unsafe (#3613)
• 2550caf use base64UrlEncode instead of base64Encode (#3609)
• 766cf18 use base64 encoded md5 hash of working dir to build the unique workspace dir ...
• fae6ed1 Fix type in exceptions.dart (#3602)
• ec7896c Use dart pub add to add build_runner dependency (#3599)
• 9fe0f98 allow the 3.3.x SDK in build_web_compilers and build_modules (#3593)
• 2a66be2 Freshen docs for aggregate builders (#3590)
• 2ba1102 release build_resolvers 2.4.1 (#3587)
• 5eb5d9b update to the latest dart_flutter_team_lints (#3582)
• Additional commits viewable in compare view

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