[client-python] chore(deps): update actions/github-script action to v9

Author: renovate[bot]

.github/workflows/auto-label-issues.yml

@@ -8,7 +8,7 @@ jobs:
     permissions:
       issues: write
     steps:
-      - uses: actions/github-script@v8
+      - uses: actions/github-script@v9
         with:
           script: |
             await github.rest.issues.addLabels({

.github/workflows/update-linked-issues-on-merge.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Update linked issues with label and milestone
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |