CI: Test PHP 7.2 to 8.4

Author: PhrozenByte

.github/workflows/testing.yml

@@ -12,7 +12,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ 'ubuntu-latest', 'windows-latest', 'macos-latest' ]
-                php-version: [ '7.2', '7.3', '7.4', '8.0' ]
+                php-version: [ '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
                 include:
                     -   operating-system: ubuntu-latest
                         php-version: '7.2'
@@ -44,4 +44,3 @@ jobs:
 
             -   name: Check code coverage
                 run: ./vendor/bin/coverage-check clover.xml 100
-                if: matrix.php-version != '8.0'