chore(deps): update actions/github-script action to v8 (#267)

Author: renovate-bot

.github/workflows/periodic-reporter.yaml

@@ -25,7 +25,7 @@ jobs:
       issues: 'write'
 
     steps:
-      - uses: 'actions/github-script@v7'
+      - uses: 'actions/github-script@v8'
         with:
           script: |
             // Label for all issues opened by reporter

.github/workflows/validate_syntax.yaml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
 
       - name: Get source files
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         id: get-files
         with:
           script: |