fix(deps): Remove absolute requirements

[Spacerat]

Summary of Changes

This removes absolute requirements from the requirements.txt file.

Motivation

The specific requirement which has been causing me problems is attrs==18.1.0. I have been working on a Looker integration, but the looker_sdk library users a feature of attrs only available in >=19. When I install both libraries at the same time, pip installs attrs==18.1.0 due to amundsendatabuilder's restriction, and then looker_sdk fails.

It is worth noting that Looker ought to update their own setup.py to include attrs>=19.0.0 or something like that, but all that would do is make this problem happen at pip install time instead of runtime.

In general, pinning dependencies in libraries is liable to cause this kind of problem. I also noticed that a lot of the pinned dependencies were transitive dependencies not actually required by amundsendatabuilder itself. My feeling is that unless there's a specific reason to pin them due to e.g. a bug or issue, pip can sort these out itself.

Thus, I have removed all transitive dependencies in requirements.txt, and changed remaining dependencies from == to >=.

I have also incremented the version number to 3.1.0 so that this change can be picked up immediately.

This is a fairly significant change so I understand if it needs some work - please let me know if there's anything else I need to do.

Tests

No new tests needed. Hopefully this will just pass in CI.

Documentation

N/A

CheckList

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• PR passes make test

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