ci: add master core install for lint/test/dev

[efriis]

No description provided.

[efriis]

@cbornet integration tests seem to be failing for unrelated reason - let me know if it's due to a change in core!

[hemidactylus]

Hi, @efriis , thank you for taking care of this upgrade and spotting the test failure. It was indeed related to a randomness-induced flakiness, which is addressed in #15. That should be merged momentarily - and this PR, once rebased, will certainly pass.

Thank you!

[hemidactylus]

(I also believe that method async def aload(self) -> List[Document] can be removed from AstraDBLoader as it is now provided by the base class with 0.1.41, but this is not critical)

[cbornet]

@efriis #15 has been merged. Can you rebase the PR ?

[hemidactylus]

I should have been able to do it myself as one side was pure code and the other was pure dependencies. Could please @cbornet or @efriis take a look?

[efriis]

oops thanks for merging!