Update Linting Dependencies

[sco1]

The bot repository needs some linting adjustments to bring it in line with the rest of the organization.

• Add flake8-docstrings as a dev dependency
• Add flake8-annotations as a dev dependency
• Relock dependencies
• Update linting rules (See: Completing the move to flake8-docstrings #335)
• Relint repository
• Add pre-commit as a dev dependency
• Add pre-commit configuration
• Add pre-commit install to pipenv scripts

Because of the >1000 lines of changes that will be required required once flake8-docstrings is added, this should be deferred until the django migration is very near completion so we don't unnecessarily contribute to the merging nightmare.