workflow: Update actions/github-script to v8 (#785)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/pr-status-label-new.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.event_name == 'pull_request_target' && github.event.action == 'opened'
     steps:
       - name: Label new PR as "status:waiting for review"
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             github.rest.issues.addLabels({

.github/workflows/pr-status-label-review.yml

@@ -44,7 +44,7 @@ jobs:
         run: unzip "${{ runner.temp }}/artifacts/review-event.zip" -d "${{ runner.temp }}/artifacts"
 
       - name: Update status labels based on review
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const fs = require('fs');

.github/workflows/pr-status-label-schedule.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Promote approved PRs to "ready to merge"
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const owner = context.repo.owner