fix style

tests.py

@@ -98,12 +98,11 @@ def test_prepare_environment(tmp_path):
     # check if the git branch is correctly checked out. We expect output such as
     # git_branch_stdout = '* dev-23a\n  develop\n'
     # The entry with the '* ' prefix is the active branch.
-    git_branch_output_raw = \
-        subprocess.run(
-            f"cd {str(release_base_dir/spack_environments)} && git branch",
-            shell=True,
-            capture_output=True,
-        )
+    git_branch_output_raw = subprocess.run(
+        f"cd {str(release_base_dir/spack_environments)} && git branch",
+        shell=True,
+        capture_output=True,
+    )
     git_branch_stdout = git_branch_output_raw.stdout.decode("utf-8")
     assert f"* {mpsd_release_to_test}" in git_branch_stdout