Update eifinger/setup-uv action to v6.6.0 (#2530)

Author: nextest-bot

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Install nextest for help text in docs
         uses: taiki-e/install-action@nextest
       - name: Install uv
-        uses: eifinger/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
+        uses: eifinger/setup-uv@4959332f0f014c5280e7eac8b70c90cb574c9f9b # v6.6.0
         with:
           enable-cache: true
       - name: Build rustdoc