makes post release cleanup job run on java 17 (#5924)

Author: davidmotson

.github/workflows/post_release_cleanup.yml

@@ -15,7 +15,12 @@ jobs:
  - uses: actions/checkout@v4.1.1
  with:
  fetch-depth: 0
-
+ - name: Set up JDK 17
+ uses: actions/setup-java@v4.1.0
+ with:
+ java-version: 17
+ distribution: temurin
+ cache: gradle
  - name: Run post release cleanup task
  run: |
  ./gradlew postReleaseCleanup