chore: bump file from 6.1.4 to 7.0.0

Bumps [file](https://github.com/google/file.dart/tree/master/packages) from 6.1.4 to 7.0.0.
- [Release notes](https://github.com/google/file.dart/releases)
- [Commits](https://github.com/google/file.dart/commits/v7.0.0/packages)

---
updated-dependencies:
- dependency-name: file
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
   analyzer: ">=5.13.0 <7.0.0"
   args: ^2.4.2
   cli_completion: ">=0.3.0 <0.5.0"
-  file: ^6.1.4 # build_version want 6.1.4
+  file: ">=6.1.4 <8.0.0" # build_version want 6.1.4
   glob: ^2.1.2
   mason_logger: ^0.2.6
   path: ^1.8.3