chore(deps-dev): bump gulp-header from 2.0.7 to 2.0.9

Bumps [gulp-header](https://github.com/tracker1/gulp-header) from 2.0.7 to 2.0.9.
- [Release notes](https://github.com/tracker1/gulp-header/releases)
- [Changelog](https://github.com/tracker1/gulp-header/blob/master/changelog.md)
- [Commits](gulp-community/gulp-header@v2.0.7...v2.0.9)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "gulp-concat": "^2.6.1",
     "gulp-cssnano": "^2.1.3",
     "gulp-flatmap": "^1.0.2",
-    "gulp-header": "^2.0.7",
+    "gulp-header": "^2.0.9",
     "gulp-optimize-js": "^1.1.0",
     "gulp-rename": "^1.4.0",
     "gulp-sass": "^4.0.2",