chore: remove invalid and obsolete Dependabot filter (#5147)

Author: Flash0ver

.github/dependabot.yml

@@ -22,6 +22,3 @@ updates:
   directory: "/"
   schedule:
     interval: weekly
-  ignore:
-  - dependency-name: "gradle/actions/setup-gradle"
-    versions: ['>= 6.0.0'] # license change: the bundled 'gradle-actions-caching' component is licensed and governed by a separate license (no longer MIT)