Add version bump automation

[kmcquade]

What does this PR do?

Basically the same as salesforce/aws-allowlister#73.

• Adds a GitHub action to bump $project_name/bin/version.py by patch (major.minor.patch) immediately after a release so the next release will be a new version. This way I don't have to do this manually.
• It also runs on workflow_dispatch so I can trigger this from the GitHub actions UI directly.

The process for releasing a new version is now as follows:

• Go to the releases tab, observe that the release drafter GitHub action has created a draft release for you. Hit publish as you did before. Observe that after the new version is published, the path $project_name/bin/version.py will be updated. This way, you can just publish new versions by following the release drafter workflow without having to update the version.py file at all.

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Completion checklist

• Additions and changes have unit tests
• Unit tests, Pylint, security testing, and Integration tests are passing.. GitHub actions does this automatically
• The pull request has been appropriately labeled using the provided PR labels