feat(pre-commit): support python additional_dependencies

[trim21]

partial support for #20780

Changes

pre-commit hooks additional_dependencies are dynamic to many language, so we only support it if it's defined as language: python.

Normally hooks from repo doesn't need this, but add it also doesn't break anything and make our work must more easy so we do not need to do a extra http request and parse hooks from arbitrary repo in extracter.

support this kind of pre-commit config:

  - repo: https://github.com/psf/black
    rev: 19.3b0
    hooks:
      - id: black
        language: python
        additional_dependencies:
          - "request==1.1.1"

and this won't work:

  - repo: https://github.com/psf/black
    rev: 19.3b0
    hooks:
      - id: black
        additional_dependencies:
          - "request==1.1.1"

Context

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

trim21/bencode-py@ad08e6e
trim21/bencode-py@47abeed

[renovate-release]

🎉 This PR is included in version 39.95.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 39.95.0

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