Update shivammathur/setup-php action to v2.29.0

| datasource  | package                | from   | to     |
| ----------- | ---------------------- | ------ | ------ |
| github-tags | shivammathur/setup-php | 2.28.0 | 2.29.0 |

.github/workflows/scheduled-unit-tests.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/[email protected]
       - name: Setup PHP Action
-        uses: shivammathur/setup-php@2.28.0
+        uses: shivammathur/setup-php@2.29.0
         with:
           php-version: 8.1
       - name: Install latest dependencies