[tune](deps): Bump ax-platform from 0.1.20 to 0.2.1 in /python/requirements/tune

[dependabot[bot]]

Bumps ax-platform from 0.1.20 to 0.2.1.

Release notes

Sourced from ax-platform's releases.

v0.2.1: Release

What’s new?

1. Support Multi-Objective Optimizations for the Service API.
2. Deprecation of SimpleExperiment
3. Several minor tutorial and documentation corrections.
4. Documentation is no longer released with errors in tutorials.

Bugfixes

• IndexError when only using a subset of fields in raw data (facebook/Ax#652)

v0.2.0 Release

What’s new?

1. Modular BotAx + tutorial: new flexible setup for combining BoTorch subcomponents into a Model in Ax,
2. Scheduler + tutorial: new standalone configurable manager abstraction to run asynchronous closed-loop experiments with Ax (with or without human-in-the-loop),
3. GenerationStrategy tutorial: walkthrough for optimization algorithms specification in in Ax,
4. Bayesian optimization with categorical kernels exposed in Ax and auto-selected in Service and Loop APIs (via choose_generation_strategy). This eliminates the need to opt for Sobol quasi-random search when a given search space contains predominantly choice (a.k.a. categorical or discrete) parameters,
5. Scalarized outcome constraint support (feature request: facebook/Ax#472),
6. Extended exp_to_df utility to conveniently display an Ax Experiment as a dataframe of trials and arms.

Bugfixes

• Abandoned arms and trials exclusion from modeling data (facebook/Ax#506),
• Changing a range parameter to fixed (facebook/Ax#383).

Commits

• 1191284 Unlink saasbo tutorials
• 52974a2 make SchedulerOptions specifiable by the user
• 7b0a489 Summary: Add paragraph from https://fb.quip.com/daVeA5U4HGDX#UPMAAAO5whE to m...
• 46e6a94 Remove SimpleExp from Eval Func glossary item
• 0474148 Remove empty cell at the end of developer api tutorial
• ef597b1 Minor fixes to visualization tutorial
• 150cd73 Update MOO tutorial to reflect threshold not being required (#658)
• 6021189 Make MOO thresholds optional/inferable (#657)
• 8162bc4 Fix typo in service API
• 6d3170e Add Service API Example to MOO tutorial (#654)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like ax-platform is no longer a dependency, so this is no longer needed.