[CI] Update astral-sh/setup-uv (#14081)

Author: srittau

.github/workflows/daily.yml

@@ -116,7 +116,7 @@ jobs:
         with:
           # Keep in sync with stub_uploader's check_scripts.yml workflow.
           python-version: "3.13"
-      - uses: astral-sh/setup-uv@v5
+      - uses: astral-sh/setup-uv@v6
       - name: Run tests
         run: |
           cd stub_uploader

.github/workflows/tests.yml

@@ -43,7 +43,7 @@ jobs:
         with:
           # Max supported Python version as of pytype 2024.10.11
           python-version: "3.12"
-      - uses: astral-sh/setup-uv@v5
+      - uses: astral-sh/setup-uv@v6
       - run: uv pip install -r requirements-tests.txt --system
       - name: Install external dependencies for 3rd-party stubs
         run: |
@@ -118,7 +118,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: "3.13"
-      - uses: astral-sh/setup-uv@v5
+      - uses: astral-sh/setup-uv@v6
       - name: Install typeshed test-suite requirements
         # Install these so we can run `get_external_stub_requirements.py`
         run: uv pip install -r requirements-tests.txt --system
@@ -183,7 +183,7 @@ jobs:
         with:
           # Keep in sync with stub_uploader's check_scripts.yml workflow.
           python-version: "3.13"
-      - uses: astral-sh/setup-uv@v5
+      - uses: astral-sh/setup-uv@v6
       - name: Run tests
         run: |
           cd stub_uploader