Update dependencies and support MLFlow 1.20

[jamie256]

Description

dependency updates: relax MLFlow dependency check, and update dependencies. Resolves #338

General Checklist

• Tests added for this feature/bug
  if it was a bug, test must cover it.
• Conform by the style guides, by using formatter
• Documentation updated
• (optional) Please add a label to your PR

[coveralls]

Pull Request Test Coverage Report for Build 1360369532

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 83.614%

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Totals
Change from base Build 1360365020:	-0.02%
Covered Lines:	3788
Relevant Lines:	4388

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💛 - Coveralls

[andyndang]

LGTM