ci: zizmor: fix hash pin

See stacklok/frizbee#206.

Signed-off-by: William Woodruff <[email protected]>

Author: woodruffw

Diff for: .github/workflows/zizmor.yml

@@ -22,7 +22,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@e4db8464a088ece1b920f60402e813ea4de65b8f # v4
+        uses: astral-sh/setup-uv@38f3f104447c67c051c4a08e39b64a148898af3a # v4
 
       - name: Run zizmor 🌈
         run: uvx zizmor --format sarif . > results.sarif