Remove pin and pyarrow dependency

[antonymilne]

Description

A proper fix following https://github.com/mckinsey/vizro/pull/274:

• remove the pyarrow dependency - this is not something we want to specify as a dependency. Instead what we should do is ignore the deprecation warning from pandas (which was confusingly written so made it sound like we should add pyarrow as a dependency)
• remove upper pin for kedro and pandas. Our kedro test broke with the release of 0.19.2 due to https://github.com/kedro-org/kedro/pull/3451 and is fixed by adding kedro-datasets as a dependency

Also:

• moved some dependencies pinned by Snyk to optional ones since they only come about from kedro. These should never have been in the core dependencies, and actually it highlights a fundamental flaw in the use of Snyk that we shouldn't be responsible for transitive dependency versions at all really - to be discussed more another time

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