use php-cs-fixer on php 7.4, but show the diff

Author: fain182

.github/workflows/build.yml

@@ -43,8 +43,8 @@ jobs:
       run: composer install --prefer-dist
 
     - name: Coding Standard Checks
-      if: ${{ matrix.php-versions  == '8.4' }}
-      run: PHP_CS_FIXER_IGNORE_ENV=1 ./bin/php-cs-fixer fix --dry-run -v
+      if: ${{ matrix.php-versions  == '7.4' }}
+      run: PHP_CS_FIXER_IGNORE_ENV=1 ./bin/php-cs-fixer fix --dry-run --diff
 
     - name: Static Analysis
       if: ${{ matrix.php-versions  == '7.4' }}