Test with ibm_db2 on PHP 8.4

Author: morozov

.github/workflows/continuous-integration.yml

@@ -218,9 +218,7 @@ jobs:
       matrix:
         php-version:
           - "7.4"
-          - "8.3"
-          # The DB2 workflow currently segfaults with PHP 8.4
-          # - "8.4"
+          - "8.4"
 
   development-deps:
     name: "PHPUnit with PDO_SQLite and development dependencies"