build(deps): bump file-type from 16.5.4 to 21.3.1 in /extensions/git (#300597)

* build(deps): bump file-type from 16.5.4 to 21.3.1 in /extensions/git

Bumps [file-type](https://github.com/sindresorhus/file-type) from 16.5.4 to 21.3.1.
- [Release notes](https://github.com/sindresorhus/file-type/releases)
- [Commits](https://github.com/sindresorhus/file-type/compare/v16.5.4...v21.3.1)

---
updated-dependencies:
- dependency-name: file-type
  dependency-version: 21.3.1
  dependency-type: direct:production
...

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

* fix(git): update file-type import for v21.x API (#301231)

* Initial plan

* fix: update file-type import for v21.x API changes

Co-authored-by: rzhao271 <7199958+rzhao271@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rzhao271 <7199958+rzhao271@users.noreply.github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Raymond Zhao <7199958+rzhao271@users.noreply.github.com>
Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>

extensions/git/package.json

@@ -4348,7 +4348,7 @@
     "@joaomoreno/unique-names-generator": "^5.2.0",
     "@vscode/extension-telemetry": "^0.9.8",
     "byline": "^5.0.0",
-    "file-type": "16.5.4",
+    "file-type": "21.3.1",
     "picomatch": "2.3.1",
     "vscode-uri": "^2.0.0",
     "which": "4.0.0"