Update workflow and script for improved release handling

Upgraded actions/checkout to v4 in the workflow and removed redundant re-approval step. Improved get-gh-release.sh by fixing whitespace, enabling output file update, and adding a completion message.

.github/workflows/get-versions-from-gh.yaml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: community-scripts/ProxmoxVED
           ref: main
@@ -70,13 +70,3 @@ jobs:
           if [ -n "$PR_NUMBER" ]; then
             gh pr review $PR_NUMBER --approve
           fi
-
-      - name: Re-approve pull request after update
-        if: env.changed == 'true'
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          PR_NUMBER=$(gh pr list --head "update_versions" --json number --jq '.[].number')
-          if [ -n "$PR_NUMBER" ]; then
-            gh pr review $PR_NUMBER --approve
-          fi