Update workflow: Rename experimental flag to experimental-phpunit and only use for phpunit (#66)

from miraheze/.github (miraheze/.github@b901dc7)

Author: Universal-Omega

.github/workflows/mediawiki-tests.yml

@@ -18,33 +18,33 @@ jobs:
             php-docker: 81
             composer-test: true
             coverage: true
-            experimental: false
             experimental-phan: false
+            experimental-phpunit: false
 
           # Latest MediaWiki beta - PHP 8.1
           - mw: 'REL1_44'
             php: 8.1
             php-docker: 81
             composer-test: false
             coverage: false
-            experimental: false
             experimental-phan: true
+            experimental-phpunit: false
 
           # Latest MediaWiki master - PHP 8.1
           - mw: 'master'
             php: 8.1
             php-docker: 81
             composer-test: false
             coverage: false
-            experimental: true
             experimental-phan: true
+            experimental-phpunit: true
 
     with:
       mw: ${{ matrix.mw }}
       php: ${{ matrix.php }}
       php-docker: ${{ matrix.php-docker }}
-      experimental: ${{ matrix.experimental }}
       experimental-phan: ${{ matrix.experimental-phan }}
+      experimental-phpunit: ${{ matrix.experimental-phpunit }}
       composer-test: ${{ matrix.composer-test }}
       coverage: ${{ matrix.coverage }}