Update astral-sh/setup-uv action to v8

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -29,7 +29,7 @@ jobs:
           go-version: stable
           # We use this to install `buf`, and the `buf` version is controlled by the Makefile.
           cache-dependency-path: Makefile
-      - uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
+      - uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
         with:
           python-version: ${{ matrix.python-version }}
       - run: make install

.github/workflows/release.yaml

@@ -19,7 +19,7 @@ jobs:
         run: |
           VERSION=${{github.head_ref}}
           echo "VERSION=${VERSION##*/}" >> $GITHUB_ENV
-      - uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
+      - uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
       - name: Build release
         run: |
           uv build