Merge pull request #7835 from takano32/use-php-8.1-for-php-documentor

[GitHub Actions] Use PHP 8.1 for phpDocumentor

Author: kenjis

.github/workflows/deploy-apidocs.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.0'
+          php-version: '8.1'
           tools: phive
           coverage: none