chore: Pin Python packages for codegen using uv

[mathbunnyru]

High Level Overview of Change

This PR pins package versions so that the depth-first bot does not get confused.
A bit better implementation of #7291.
Closes: #7291

uv is getting more and more popular, while hashin is not so popular and is restricted for 1 task only.

Context of Change

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[mathbunnyru]

This file has been completely autogenerated using this command - this is better than mixing auto-generated and manually written files.

[Copilot]

Pull request overview

Pins the Python dependencies used by the protocol code generation tooling (invoked via CMake setup_code_gen) to make installs deterministic and avoid dependency-resolution drift.

Changes:

• Introduces a requirements.in source file with unpinned/min-version constraints for codegen dependencies.
• Replaces the prior loose requirements.txt with a uv pip compile --generate-hashes output that pins exact versions and includes hashes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
cmake/scripts/codegen/requirements.txt	Switches to a uv-compiled, fully pinned (+ hashed) requirements file for deterministic installs.
cmake/scripts/codegen/requirements.in	Adds the human-edited input file used to generate the pinned requirements.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.4%. Comparing base (49cb3f4) to head (c34c47c).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7329   +/-   ##
=======================================
  Coverage     82.4%   82.4%           
=======================================
  Files         1011    1011           
  Lines        76338   76382   +44     
  Branches      7311    7310    -1     
=======================================
+ Hits         62868   62912   +44     
  Misses       13470   13470           

see 6 files with indirect coverage changes

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