chore(gym): bump Gym to 88b5e0e0

[yfw]

What does this PR do ?

Advance the Gym workspace to 88b5e0e0 and refresh the uv lockfile for its updated dependency metadata.

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✅ Submodule Fast-Forward Check Results

Check based on commit: 3ba64ea (PR #3735 from yifu/gym_bump_20260819)

✅ Submodules that are properly updated:

Gym: ✅ PR branch is ahead of main branch (fast-forward)

All submodule changes look good! ✨

[yfw]

/ok to test 3ba64ea

[yfw]

Gym already bumped here #3648