chore(deps): update ghcr.io/openapi-generators/openapi-test-server docker tag to v0.2.1

Author: renovate[bot]

.github/workflows/checks.yml

@@ -158,7 +158,7 @@ jobs:
           - ""
     services:
       openapi-test-server:
-        image: ghcr.io/openapi-generators/openapi-test-server:0.0.1
+        image: ghcr.io/openapi-generators/openapi-test-server:0.2.1
         ports:
           - "3000:3000"
     steps: