[Python] Tests with pandas master failing due to freq assertion

[asfimport]

Nightly pandas master tests are failing, eg https://circleci.com/gh/ursa-labs/crossbow/11858?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

This is caused by a change in pandas, see pandas-dev/pandas#33815 (comment)

Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Joris Van den Bossche / @jorisvandenbossche

PRs and other links:

• GitHub Pull Request #7124

_{Note: This issue was originally created as ARROW-8643. Please see the migration documentation for further details.}

[asfimport]

Krisztian Szucs / @kszucs:
Issue resolved by pull request 7124
#7124