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

---

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.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.02%. Comparing base (88f3fbe) to head (d6e050b).

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           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.