minor #167 add CI jobs for Symfony 8.1 (xabbuh)

This PR was merged into the 0.4-dev branch.

Discussion
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add CI jobs for Symfony 8.1

Commits
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b9b292e add CI jobs for Symfony 8.1

Author: xabbuh

.github/workflows/ci.yaml

@@ -78,6 +78,9 @@ jobs:
           - php-version: '8.4'
             composer-options: '--prefer-stable'
             symfony-version: '8.0.*'
+          - php-version: '8.4'
+            composer-options: '--prefer-stable'
+            symfony-version: '8.1.*'
           - php-version: '8.5'
             composer-options: '--prefer-stable'
             symfony-version: '7.3.*'
@@ -87,6 +90,9 @@ jobs:
           - php-version: '8.5'
             composer-options: '--prefer-stable'
             symfony-version: '8.0.*'
+          - php-version: '8.5'
+            composer-options: '--prefer-stable'
+            symfony-version: '8.1.*'
 
     steps:
       - name: 'Check out'