[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

scripts/_helpers.py

@@ -228,7 +228,8 @@ def mock_snakemake(
     root_dir=None,
     configfiles=[],
     submodule_dir="workflow/submodules/pypsa-eur",
-        **wildcards):
+    **wildcards,
+):
     """
     This function is expected to be executed from the 'scripts'-directory of '
     the snakemake project. It returns a snakemake.script.Snakemake object,