fix: use update instead of install

Author: tam5

.github/workflows/run-tests.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          composer install --${{ matrix.stability }} --prefer-dist --no-interaction
+          composer update --${{ matrix.stability }} --prefer-dist --no-interaction
 
       - name: Execute tests
         run: vendor/bin/phpunit