ci(deps): bump astral-sh/setup-uv from 5 to 6

Bumps astral-sh/setup-uv from 5 to 6 with new features including .tools-versions support and improved caching options.

Author: dependabot[bot]

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
         run: docker info
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v6
         with:
           version: "0.6.9"