[ci] drop build 7.x

.github/workflows/continuous-integration.yml

@@ -12,10 +12,10 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        php_version: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+        php_version: ['8.0', '8.1', '8.2', '8.3', '8.4']
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
@@ -50,5 +50,3 @@ jobs:
             $(if test "${{ matrix.php_version }}" = "8.0"; then printf %s '--tag=dannecron/php-for-dev:latest'; fi) \
             ./v${{ matrix.php_version }}
           echo "Done"
-
-