chore: Fix pre-commit path matching for YAML

[philprime]

While working on #5838 I noticed that the YAML files in the .github/workflows path were not linted/formatted on commit, but then fails in the CI.

It turns out the multi-extension matching needs to be parentheses not curly-brackets because the pattern is a Python regex (docs) and can be evaluated like this:

$ python3 -c "import re; print(re.match(r'^.*\.{yaml,yml}$', '.github/workflows/benchmarking.yml'))"
None

$ python3 -c "import re; print(re.match(r'^.*\.(yaml|yml)$', '.github/workflows/benchmarking.yml'))"
<re.Match object; span=(0, 34), match='.github/workflows/benchmarking.yml'>

#skip-changelog

[philipphofmann]

LGTM