chore(deps): update dependency file to v7

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
file (source)	dependencies	major	^6.1.4 -> ^7.0.0

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Release Notes

google/file.dart (file)

### [`v7.0.0`](https://togithub.com/google/file.dart/blob/HEAD/packages/file/CHANGELOG.md#700) - Dart 3 fixes for class modifiers. - `MemoryFileSystem` now treats empty paths as non-existent. - Fix `FileSystem.isLink`/`FileSystem.isLinkSync` to not follow symbolic links. - Make the return type of `MemoryFile.openRead` and `_ChrootFile.openRead` again match the return type from `dart:io`.

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[renovate[bot]]

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