fix: gres (#31)

the previous PR was merged prematurely - the formatting was not quite
right

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Enhanced internal clarity on CPU configuration assumptions for
advanced setups. This update does not change any user-visible behavior.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

snakemake_executor_plugin_slurm_jobstep/__init__.py

@@ -154,8 +154,8 @@ def get_exec_mode(self) -> ExecMode:
 
 
 def get_cpu_setting(job: JobExecutorInterface, gpu: bool) -> str:
-    # per default, we assume that Snakemake's threads are the same as the 
-    # cpus per task or per gpu. If the user has set the cpus_per_task or 
+    # per default, we assume that Snakemake's threads are the same as the
+    # cpus per task or per gpu. If the user has set the cpus_per_task or
     # cpus_per_gpu explicitly, we use these values.
     cpus_per_task = cpus_per_gpu = job.threads
     # cpus_per_task and cpus_per_gpu are mutually exclusive