Update snakemake_executor_plugin_slurm/__init__.py

introduced "raise Error from exception" as suggested by coderabbit - while not necessary, it can make future error handling a bit more traceable.

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

snakemake_executor_plugin_slurm/__init__.py

@@ -415,7 +415,7 @@ def cancel_jobs(self, active_jobs: List[SubmittedJobInfo]):
                 raise WorkflowError(
                     "Unable to cancel jobs with scancel "
                     f"(exit code {e.returncode}){msg}"
-                )
+                ) from e
 
     async def job_stati(self, command):
         """Obtain SLURM job status of all submitted jobs with sacct