MAINT: bump astral-sh/setup-uv from 3 to 4

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 3 to 4.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci-docs.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{env.PYTHON_VERSION}}
-      - uses: astral-sh/setup-uv@v3
+      - uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
       - name: Build documentation without running notebooks
@@ -47,7 +47,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{env.PYTHON_VERSION}}
-      - uses: astral-sh/setup-uv@v3
+      - uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
       - run: |
@@ -73,7 +73,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{env.PYTHON_VERSION}}
-      - uses: astral-sh/setup-uv@v3
+      - uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
       - name: Check external links with Sphinx linkcheck