CI: Bump uv versions to 6

Author: Epse

.github/workflows/pypi.yml

@@ -18,6 +18,6 @@ jobs:
       id-token: write
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v3
+      - uses: astral-sh/setup-uv@v6
       - run: uv build
       - run: uv publish --trusted-publishing always

.github/workflows/sphinx-documentation.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Building HTML
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v6
       - shell: bash -l {0}
         run: |
           uv run sphinx-build -M html docs/source/ docs/build/