Revert "ci: bump actions/github-script from 6 to 7 (#5966)"

This reverts commit 0531c16326.

.github/workflows/nightly_pr_comment.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v6
         with:
           script: |
             const {owner, repo} = context.repo;

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
         shell: bash
 
       - name: Create tag
-        uses: actions/github-script@v7
+        uses: actions/github-script@v6
         with:
           script: |
             github.rest.git.createRef({