exclude impossible version matrix combinations

Author: transistive

.github/workflows/tests.yml

@@ -10,6 +10,15 @@ jobs:
       matrix:
         php: [ '7.4', '8.0', '8.1', '8.2']
         sf_version: [ '5.4.*', '6.2.*', '6.3.*' ]
+        exclude:
+          - php: 7.4
+            sf_version: 6.2.*
+          - php: 8.0
+            sf_version: 6.2.*
+          - php: 7.4
+            sf_version: 6.3.*
+          - php: 8.0
+            sf_version: 6.3.*
 
     steps:
       - uses: actions/checkout@v2