Update astral-sh/setup-uv action to v8

Author: renovate[bot]

.github/workflows/publish-slides.yaml

@@ -19,7 +19,7 @@ jobs:
         uses: quarto-dev/quarto-actions/setup@v2
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@v8
         with:
           # Install a specific version of uv.
           version: "0.9.8"