switch buildbot to bookworm-openwrt

Author: pexcn

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
   build:
     runs-on: ubuntu-22.04
     container:
-      image: pexcn/docker-images:buster-openwrt
+      image: pexcn/docker-images:bookworm-openwrt
       volumes:
         - /usr/local/lib/android:/usr/local/lib/android
         - /usr/share/dotnet:/usr/share/dotnet