Test on lowest and highest dependencies

Author: ihor-sviziev

.github/workflows/php.yml

@@ -17,11 +17,12 @@ jobs:
           - "7.2"
           - "7.3"
           - "7.4"
-          - "8.0"
         dependencies:
-          - "locked"
           - "lowest"
           - "highest"
+        include:
+          - php-version: "8.0"
+            composer-options: "--ignore-platform-reqs"
     name: Tests with PHP ${{ matrix.php-version }} and ${{ matrix.dependencies }} dependencies
 
     steps: