Automatic uv version resolution

[AndreuCodina]

No description provided.

[Copilot]

Pull Request Overview

This PR implements automatic uv version resolution by moving version constraints from the build system to the [tool.uv] configuration section and updating GitHub Actions to use version-file resolution.

• Moved uv version constraints from requires to [tool.uv] section for better version management
• Updated GitHub Actions to use uv's version-file feature with lowest resolution strategy
• Changed environment variable value to lowercase for consistency

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Moved uv version constraint to [tool.uv] section and removed from build requirements
.github/workflows/pull_request.yaml	Updated uv setup action to v7.1.0 with version-file resolution and environment variable case

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