fix: update GitHub Actions to support Node.js 24

- Update actions/checkout from v4 to v4.2.2 for Node.js 24 support
- Update google-github-actions/auth from v2 to v2.1.4 for Node.js 24 support

GitHub Actions runners are deprecating Node.js 20 and forcing Node.js 24.
These action updates ensure compatibility with the new runtime.

Author: rafabene

.github/workflows/open-prs-digest.yml

@@ -18,7 +18,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
 
@@ -65,7 +65,7 @@ jobs:
            JIRA_API_TOKEN: ${{ secrets.JIRA_API_TOKEN }}
 
       - name: Authenticate to GCP
-        uses: google-github-actions/auth@c200f3691d83b41bf9bbd8638997a462592937ed # v2
+        uses: google-github-actions/auth@71fee32af4ce9b6f7d57c7b86c2cc8147ceadc51 # v2.1.4
         with:
           credentials_json: ${{ secrets.GCP_SA_KEY }}
           create_credentials_file: false