[fix] The python dep should match prql project

[z3z1ma]

Just a quick fix for the python dependency. Poetry freaks out of python deps dont match the toml

[z3z1ma]

I have confirmed this allows dbt-prql to be installed alongside dbt-core 1.1.1 on python 3.9
where otherwise dependency resolution was impossible. There are probably a significant number of users this will affect if not corrected simply because the dependencies are not relaxed. (happens when you do poetry init)

[max-sixty]

One concern I had with unpinning it is that the internal dbt code may change such that it stops working, and it's not possible to later say "that doesn't work after 1.1.4".

But I think we can free the pin for patch versions, you make a good argument. For minor versions (i.e. 0.X), I do think it's worth testing before releasing, and I'm happy to do that at a decent cadence.

If we add tests which test against dbt-core/main, we catch upstream breaks early, then we can unpin minor versions too...

[max-sixty]

This is released @z3z1ma . Thanks for the PR!