fix: Restore producer pre-resolve step for SCC plugin caching

The pre-resolve of the producer module caches the SCC plugin and its
httpclient dependency, preventing the classrealm conflict in the
subsequent reactor build. Removing this line caused even the common
module to fail.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: marcingrzejszczak

.github/workflows/maven.yml

@@ -24,5 +24,6 @@ jobs:
     - name: Pre-resolve SCC plugin to avoid classloader conflict
       run: |
         cd common && ./mvnw dependency:resolve-plugins -B && cd ..
+        ./mvnw dependency:resolve-plugins -Ptest -B -pl producer || true
     - name: Build with Maven
       run: ./scripts/runMavenBuilds.sh