Remove PHP 8.0 for the moment

See https://github.com/xp-framework/ast/actions/runs/14282378280/job/40033402140

Author: thekid

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+        php-versions: ['7.4', '8.1', '8.2', '8.3', '8.4']
         os: [ubuntu-latest, windows-latest]
 
     steps: