chore(deps): update astral-sh/setup-uv action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           repository: curl/curl-fuzzer
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@445689ea25e0de0a23313031f5fe577c74ae45a1 # v6
       - name: Set matrix
         id: set-matrix
         run: |