There's a merged pull request on the void-packages repository

hook: python-shebang: check for shebang in the first line only
https://github.com/void-linux/void-packages/pull/17837

Description:
- Grepping whole files is inefficient
- git-instaweb (in git package) has the code to generate python file in
  a here doc in the middle of its code, old hook generates false
  positive with this package