vagrant: use debian/bookworm64 box

Vagrantfile

@@ -376,7 +376,7 @@ Vagrant.configure(2) do |config|
   end
 
   config.vm.define "bookworm64" do |b|
-    b.vm.box = "debian/testing64"
+    b.vm.box = "debian/bookworm64"
     b.vm.provider :virtualbox do |v|
       v.memory = 1024 + $wmem
     end