Remove pyarrow dependency upper bound cap

[Keshi Dai]

Pyarrow dependency has been capped at <7.

Is it possible to remove this cap? The latest version of pyarrow is 11.0. Removing this upper bound cap will allow folks to use TFDV with other frameworks.

[Niraj Singh]

@daikeshi,

Thank you for creating the PR for upgrading pyarrow. Once reviewed, the PR will be merged. Thanks!