chore: use uv for faster pip compile

[alexeagle]

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Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Now uses https://github.com/theoremlp/rules_uv to run https://github.com/astral-sh/uv for pip compile to lock python requirements, reported to be 95% faster.

Test plan

• Covered by existing test cases