Update tests.yml

Author: GrahamCampbell

.github/workflows/tests.yml

@@ -34,7 +34,9 @@ jobs:
           coverage: none
 
       - name: Install dependencies
-        run: composer require "illuminate/contracts=${{ matrix.laravel }}" --prefer-dist --no-interaction --no-progress
+        run: |
+          composer require "illuminate/contracts=${{ matrix.laravel }}" --no-update
+          composer update --prefer-dist --no-interaction --no-progress
 
       - name: Execute tests
         run: vendor/bin/phpunit --verbose