pw_presubmit: Make with_filter() args keyword-only

Change-Id: I1ee8c442a122982324595435ea0f259e18a19f5f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/62060
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_presubmit/py/pw_presubmit/presubmit.py b/pw_presubmit/py/pw_presubmit/presubmit.py
index f733902..d9a6377 100644
--- a/pw_presubmit/py/pw_presubmit/presubmit.py
+++ b/pw_presubmit/py/pw_presubmit/presubmit.py
@@ -496,6 +496,7 @@
 
     def with_filter(
         self,
+        *,
         endswith: Iterable[str] = '',
         exclude: Iterable[Union[Pattern[str], str]] = ()
     ) -> Check: