Update dependency file to v7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
file (source)	dependencies	major	^6.0.0 -> ^7.0.0

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Release Notes

dart-lang/tools (file)

v7.0.1

Compare Source

• Update the pubspec repository field to reflect the new package repository.

v7.0.0

• Dart 3 fixes for class modifiers.
• Require Dart 3.0.
• 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.02%. Comparing base (c3ce9ec) to head (9509930).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #215   +/-   ##
=======================================
  Coverage   35.02%   35.02%           
=======================================
  Files          97       97           
  Lines        4994     4994           
=======================================
  Hits         1749     1749           
  Misses       3245     3245           

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