RUBY-537 Fix codeception path in github workflow

Author: mw-surplex

.github/workflows/test.yml

@@ -31,4 +31,4 @@ jobs:
       if: steps.composer-cache.outputs.cache-hit != 'true'
       run: composer install --no-progress --no-suggest
     - name: Run unit tests
-      run: vendor/bin/codecept run unit
+      run: bin/codecept run unit