CI checks doesn't catch commit subject whitespace errors
```
$ git log --format="%s" | head -n 10
CLN: revisit build warnings in cython templates
 ENH: Raise ValueError for unsupported Window functions (#27275)
BUG: fix inserting tz-aware datetime to Series, closes #12862 (#27322)
CLN: requested follow-ups (#27332)
BUG: Consistent division by zero behavior for Index/Series (#27321)
TST: suppress rolling warnings correctly for raw= (#27330)
CLN: replace usage internally of .iteritems with .items (#26114)
BUG: appending a Timedelta to Series incorrectly casts to integer (#27303)
CLN: Split test_window.py (#27305)
check early for non-scalar default_fill_value (#27302)
```
```
$ git log --format="%s" | grep "^ " | wc -l
44
```
There are multiple recent instances.