Remove PHP 7.4 from CI build pipeline

Author: andrewdalpino

.github/workflows/ci-ext.yml

@@ -21,14 +21,14 @@ jobs:
     strategy:
       matrix:
         image:
-          - php:7.4-cli
-          - php:7.4-cli-alpine
           - php:8.0-cli
           - php:8.0-cli-alpine
           - php:8.1-cli
           - php:8.1-cli-alpine
           - php:8.2-cli
           - php:8.2-cli-alpine
+          - php:8.3-cli
+          - php:8.3-cli-alpine
 
     name: Image ${{ matrix.image }}
     runs-on: ubuntu-latest