Fix build composer platform reqs #10

Author: odan

.github/workflows/build.yml

@@ -35,14 +35,12 @@ jobs:
         run: composer validate
 
       - name: Install dependencies for PHP 7
+        if: matrix.php-versions < '8.0'
         run: composer update --prefer-dist --no-progress
-        with:
-          php-version: [ '7.2', '7.3', '7.4' ]
 
       - name: Install dependencies for PHP 8
+        if: matrix.php-versions >= '8.0'
         run: composer update --prefer-dist --no-progress --ignore-platform-reqs
-        with:
-          php-version: [ '8.0' ]
 
       - name: Run test suite
         run: composer check