Update .github/workflows/contrib.yml

Author: emdneto

.github/workflows/contrib.yml

@@ -8,6 +8,6 @@ on:
 
 jobs:
   contrib_0:
-    uses: emdneto/opentelemetry-python-contrib/.github/workflows/core_contrib_test_0.yml@generate-workflows-core
+    uses: open-telemetry/opentelemetry-python-contrib/.github/workflows/core_contrib_test_0.yml@main
     with:
       CORE_REPO_SHA: ${{ github.sha }}