Update contrib.yml

Author: xrmx

.github/workflows/contrib.yml

@@ -11,4 +11,4 @@ jobs:
     uses: open-telemetry/opentelemetry-python-contrib/.github/workflows/core_contrib_test_0.yml@main
     with:
       CORE_REPO_SHA: ${{ github.sha }}
-      CONTRIB_REPO_SHA: opentelemetrybot/update-version-to-1.32.0.dev-0.53b0.dev
+      CONTRIB_REPO_SHA: main