remove CI jobs for no longer maintained Symfony versions

Author: xabbuh

.github/workflows/ci.yaml

@@ -95,33 +95,12 @@ jobs:
           - php-version: '8.0'
             composer-options: '--prefer-stable'
             symfony-version: '5.4.*'
-          - php-version: '8.0'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.0.*'
           - php-version: '8.1'
             composer-options: '--prefer-stable'
             symfony-version: '5.4.*'
-          - php-version: '8.1'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.0.*'
-          - php-version: '8.1'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.1.*'
-          - php-version: '8.1'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.2.*'
           - php-version: '8.2'
             composer-options: '--prefer-stable'
             symfony-version: '5.4.*'
-          - php-version: '8.2'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.0.*'
-          - php-version: '8.2'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.1.*'
-          - php-version: '8.2'
-            composer-options: '--prefer-stable'
-            symfony-version: '6.2.*'
 
     steps:
       - name: 'Check out'