Fix community pipelines (huggingface#3266)

Author: patrickvonplaten

src/diffusers/utils/dynamic_modules_utils.py

@@ -267,7 +267,7 @@ def get_cached_module_file(
 
         # retrieve github version that matches
         if revision is None:
-            revision = latest_version if latest_version in available_versions else "main"
+            revision = latest_version if latest_version[1:] in available_versions else "main"
             logger.info(f"Defaulting to latest_version: {revision}.")
         elif revision in available_versions:
             revision = f"v{revision}"