[phpstorm-stubs] use composer install instead of composer update

and install versions according to composer.lock

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
           PHP_VERSION: ${{matrix.php}}
 
       - name: Composer Install
-        run: docker-compose -f docker-compose.yml run -e PHP_VERSION=${{matrix.php}} test_runner composer update
+        run: docker-compose -f docker-compose.yml run -e PHP_VERSION=${{matrix.php}} test_runner composer install
         env:
           PHP_VERSION: ${{matrix.php}}
 

.gitignore

@@ -16,7 +16,6 @@ phpunit.xml
 
 # Composer
 vendor
-composer.lock
 
 .php_cs.cache
 .phpunit.result.cache