Chore(deps): Bump astral-sh/setup-uv from 4 to 6

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 4 to 6.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@v4...v6)

---
updated-dependencies:
- dependency-name: astral-sh/setup-uv
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/pr.yaml

@@ -43,7 +43,7 @@ jobs:
         with:
           python-version: '3.12'
       - name: Install uv
-        uses: astral-sh/setup-uv@v4
+        uses: astral-sh/setup-uv@v6
       - name: Install python dependencies
         run: |
           python -m venv .venv