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

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

Author: pre-commit-ci[bot]

lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_parse_cell_methods.py

@@ -126,7 +126,7 @@ def test_badly_formatted_warning(self):
         cell_method_strings = [
             # "time: maximum (interval: 1 hr comment: first bit "
             # "time: mean (interval: 1 day comment: second bit)",
-            'time',
+            "time",
             "time: (interval: 1 hr comment: first bit) "
             "time: mean (interval: 1 day comment: second bit)",
             "time: maximum (interval: 1 hr comment: first bit) "