Bump @girs/gjs from 4.0.0-beta.14 to 4.0.0-beta.15

Bumps [@girs/gjs](https://github.com/gjsify/ts-for-gir) from 4.0.0-beta.14 to 4.0.0-beta.15.
- [Release notes](https://github.com/gjsify/ts-for-gir/releases)
- [Changelog](https://github.com/gjsify/ts-for-gir/blob/main/NEWS.md)
- [Commits](gjsify/ts-for-gir@4.0.0-beta.14...4.0.0-beta.15)

---
updated-dependencies:
- dependency-name: "@girs/gjs"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -15,7 +15,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.9.1",
-    "@girs/gjs": "^4.0.0-beta.14",
+    "@girs/gjs": "^4.0.0-beta.15",
     "@girs/gnome-shell": "^46.0.2",
     "@tsconfig/strictest": "^2.0.5",
     "eslint": "^9.8.0",