tests.yml: Test on PHP 8.2/8.3/8.4

Fixes #5

Author: reedy

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [7.4, 8.0, 8.1]
+        php: [7.4, 8.0, 8.1, 8.2, 8.3, 8.4]
 
     name: PHP ${{ matrix.php }}