remove php 8.1 and 8.2 from test matrix

Author: pavog

.github/workflows/tests.yaml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.1', '8.2', '8.3', '8.4' ]
+        php-version: [ '8.3', '8.4' ]
 
     name: Run tests on PHP v${{ matrix.php-version }}
 
@@ -41,4 +41,4 @@ jobs:
         run: composer install --no-interaction --prefer-dist --no-progress
 
       - name: Run phpunit tests
-        run: vendor/bin/phpunit --colors=always --testdox
+        run: vendor/bin/phpunit --colors=always --testdox