GH Actions: clean up/simplify the matrix

No need for the `experimental` key as we can just do a comparison in the `continue-on-error` directive.

Author: jrfnl

.github/workflows/test.yml

@@ -32,50 +32,39 @@ jobs:
         # - PHP 8.1 needs PHPCS 3.6.1+ to run without errors.
         php: ['5.4', '5.5', '5.6', '7.0', '7.1', '7.2']
         phpcs_version: ['3.1.0', 'dev-master']
-        experimental: [false]
 
         include:
           # Complete the matrix, while preventing issues with PHPCS versions incompatible with certain PHP versions.
           - php: '8.1'
             phpcs_version: 'dev-master'
-            experimental: false
           - php: '8.1'
             phpcs_version: '3.6.1'
-            experimental: false
 
           - php: '8.0'
             phpcs_version: 'dev-master'
-            experimental: false
           - php: '8.0'
             phpcs_version: '3.5.7'
-            experimental: false
 
           - php: '7.4'
             phpcs_version: 'dev-master'
-            experimental: false
           - php: '7.4'
             phpcs_version: '3.5.0'
-            experimental: false
 
           - php: '7.3'
             phpcs_version: 'dev-master'
-            experimental: false
           - php: '7.3'
             phpcs_version: '3.3.1'
-            experimental: false
 
           # Experimental builds. These are allowed to fail.
           - php: '7.4'
             phpcs_version: '4.0.x-dev'
-            experimental: true
 
           - php: '8.2' # Nightly.
             phpcs_version: 'dev-master'
-            experimental: true
 
     name: "Test${{ matrix.phpcs_version == 'dev-master' && ' + Lint' || '' }}: PHP ${{ matrix.php }} - PHPCS ${{ matrix.phpcs_version }}"
 
-    continue-on-error: ${{ matrix.experimental }}
+    continue-on-error: ${{ matrix.php == '8.2' || matrix.phpcs_version == '4.0.x-dev' }}
 
     steps:
       - name: Checkout code