use mvn instead of mvnw in ci workflows

The maven wrapper files are not tracked in the repo. Use mvn
directly since setup-java already provides it.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: stalep

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get install -y jq
 
       - name: Build and test
-        run: ./mvnw -B clean verify
+        run: mvn -B clean verify
 
       - name: Upload test reports
         if: failure()

.github/workflows/pull-request.yml

@@ -22,7 +22,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get install -y jq
 
       - name: Build and test
-        run: ./mvnw -B clean verify
+        run: mvn -B clean verify
 
       - name: Upload test reports
         if: failure()