sleep more before unit tests

Author: ckoegel

.github/workflows/test-pr.yml

@@ -58,5 +58,5 @@ jobs:
         run: |
           mvn -B package --file pom.xml -DskipTests
           npm install -g @stoplight/prism-cli
-          prism mock ./bandwidth.yml & (sleep 3; mvn test -Punit-tests)
+          prism mock ./bandwidth.yml & (sleep 4; mvn test -Punit-tests)
         shell: bash