Bump autoprefixer from 10.4.14 to 10.4.15 in /frontend

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.14 to 10.4.15.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.14...10.4.15)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

frontend/package.json

@@ -51,7 +51,7 @@
     "@sveltejs/vite-plugin-svelte": "^1.4.0",
     "@tailwindcss/forms": "^0.5.4",
     "@tsconfig/svelte": "^3.0.0",
-    "autoprefixer": "^10.4.14",
+    "autoprefixer": "^10.4.15",
     "browser-fs-access": "^0.34.1",
     "class-transformer": "^0.5.1",
     "jackson-js": "^1.1.0",