upgrade setup-uv to v6

Author: sanderegg

.github/workflows/ci-pact-master.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           python-version: "3.11"
       - name: install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v6
         with:
           version: "0.6.x"
           enable-cache: false