Add pip ecosystem to dependabot

[mmcky]

Overview

Configures dependabot to also update PyPI packages in environment.yml in addition to GitHub Actions.

Changes

• Added pip package ecosystem to dependabot configuration
• Added ignore rule to keep jupyter-book < 2.0 (required until JB2 migration)

Configuration

- package-ecosystem: pip
  directory: /
  commit-message:
    prefix: ⬆️
  schedule:
    interval: weekly
  ignore:
    - dependency-name: "jupyter-book"
      versions: [">=2.0"]

This will help keep dependencies up-to-date automatically while respecting the jupyter-book version constraint.

[mmcky]

This won't actually update environment.yml files.

This will become centralised soon, so will be much less of an issue. Closing.

[github-actions]

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