Remove old sf from php8 in functional tests

Author: andrewmy

.github/workflows/ci.yml

@@ -106,6 +106,11 @@ jobs:
         symfony_version: ['4.3.*', '5.0.*', '5.2.*']
         dependencies: ['lowest', 'highest']
         rdkafka_action: ['exclude-group', 'group']
+        exclude:
+          - php: '8.0'
+            symfony_version: '4.3.*'
+          - php: '8.0'
+            symfony_version: '5.0.*'
 
     name: PHP ${{ matrix.php }} functional tests on Sf ${{ matrix.symfony_version }}, rdkafka_action=${{ matrix.rdkafka_action }}, deps=${{ matrix.dependencies }}