chore(deps): update actions/github-script action to v9 (#3038)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/github-script](https://redirect.github.com/actions/github-script)
| action | major | `v8` → `v9` |

---

### Release Notes

<details>
<summary>actions/github-script (actions/github-script)</summary>

###
[`v9`](https://redirect.github.com/actions/github-script/compare/v8...v9)

[Compare
Source](https://redirect.github.com/actions/github-script/compare/v8...v9)

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/googleapis/mcp-toolbox).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xMTAuMiIsInVwZGF0ZWRJblZlciI6IjQzLjExMC4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Co-authored-by: Yuan Teoh <45984206+Yuan325@users.noreply.github.com>

Author: renovate-bot

.github/workflows/cloud_build_failure_reporter.yml

@@ -37,7 +37,7 @@ jobs:
     runs-on: 'ubuntu-latest'
 
     steps:
-      - uses: 'actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd' # v8
+      - uses: 'actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3' # v9
         with:
           script: |-
                   // parse test names

.github/workflows/docs_preview_build_cf.yaml

@@ -98,7 +98,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Remove deploy-preview label
-        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
         with:
           script: |
             try {

.github/workflows/docs_preview_clean_cf.yaml

@@ -62,7 +62,7 @@ jobs:
           fi
 
       - name: Comment
-        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
         with:
           script: |
             github.rest.issues.createComment({

.github/workflows/docs_preview_deploy_cf.yaml

@@ -78,7 +78,7 @@ jobs:
           command: pages deploy downloaded-artifact/public --project-name toolbox-docs --branch pr-${{ steps.get_pr.outputs.pr_number }}
 
       - name: Post Preview URL Comment
-        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
         with:
           script: |
             const prNumber = parseInt('${{ steps.get_pr.outputs.pr_number }}', 10);