build(deps): bump injector from 0.19.0 to 0.20.1 (#12)

Bumps [injector](https://github.com/alecthomas/injector) from 0.19.0 to 0.20.1.
- [Release notes](https://github.com/alecthomas/injector/releases)
- [Changelog](https://github.com/alecthomas/injector/blob/master/CHANGES)
- [Commits](python-injector/injector@0.19.0...0.20.1)

---
updated-dependencies:
- dependency-name: injector
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]