Potential fix for code scanning alert no. 427: Explicit returns mixed with implicit (fall through) returns

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Signed-off-by: Hemil Desai <hemil.desai10@gmail.com>

Author: hemildesai

nemo_run/run/ray/slurm.py

@@ -334,6 +334,8 @@ def create_ray_cluster(
 
         return job_id
 
+        return None
+
     def schedule_ray_job(
         self,
         name: str,