build(deps-dev): bump gulp-header from 1.8.12 to 2.0.9

Bumps [gulp-header](https://github.com/tracker1/gulp-header) from 1.8.12 to 2.0.9.
- [Release notes](https://github.com/tracker1/gulp-header/releases)
- [Changelog](https://github.com/gulp-community/gulp-header/blob/master/changelog.md)
- [Commits](gulp-community/gulp-header@v1.8.12...v2.0.9)

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

Author: dependabot[bot]

package-lock.json

@@ -98,7 +98,7 @@
     "firebase-token-generator": "^2.0.0",
     "gulp": "^4.0.2",
     "gulp-filter": "^6.0.0",
-    "gulp-header": "^1.8.8",
+    "gulp-header": "^2.0.9",
     "gulp-typescript": "^5.0.1",
     "http-message-parser": "^0.0.34",
     "jsdom": "^15.0.0",