[2.1][BACKPORT] 7491 from master: Fix tox failure by pinning pytest dependency.

[d2iq-mergebot]

This is a backport of the following PR:

#7491

High-level description

Just released version of pytest 6.0.0 causes tox to failure.

This has been resolved by pytest pytest-dev/pytest#7565, however, as we wait for update, we could approach the problem at our end by pinning pytest to previous stable version.

Corresponding DC/OS tickets (required)

• D2IQ-70503 Pin pytest to fix tox failures in DC/OS

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Enterprise Bump PR: mesosphere/dcos-enterprise/pull/8070

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Enterprise Bump mesosphere/dcos-enterprise/pull/8070 updated.

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PR Status Checks are not Green... merging anyway

Details

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[d2iq-mergebot]

Enterprise Bump PR mesosphere/dcos-enterprise/pull/8070, and the current PR #7492 are now merged.