build(deps-dev): bump vite-plugin-singlefile from 2.1.0 to 2.2.0 (slint-ui#7836)

Bumps [vite-plugin-singlefile](https://github.com/richardtallent/vite-plugin-singlefile) from 2.1.0 to 2.2.0.
- [Release notes](https://github.com/richardtallent/vite-plugin-singlefile/releases)
- [Changelog](https://github.com/richardtallent/vite-plugin-singlefile/blob/main/CHANGELOG.md)
- [Commits](https://github.com/richardtallent/vite-plugin-singlefile/commits)

---
updated-dependencies:
- dependency-name: vite-plugin-singlefile
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pnpm-lock.yaml

@@ -30,7 +30,7 @@
     "typescript": "5.8.2",
     "vite": "6.2.2",
     "vite-figma-plugin": "0.0.24",
-    "vite-plugin-singlefile": "2.1.0",
+    "vite-plugin-singlefile": "2.2.0",
     "vitest": "3.0.8"
   },
   "dependencies": {