vagrant: Bump all Vagrant box versions

These new images include the updated, pre-pulled Docker images:
cilium/packer-ci-build#245

Signed-off-by: Paul Chaignon <paul@cilium.io>

vagrant_box_defaults.rb

@@ -3,10 +3,10 @@
 Vagrant.require_version ">= 2.2.0"
 
 $SERVER_BOX = "cilium/ubuntu-dev"
-$SERVER_VERSION= "183"
+$SERVER_VERSION= "184"
 $NETNEXT_SERVER_BOX= "cilium/ubuntu-next"
-$NETNEXT_SERVER_VERSION= "77"
+$NETNEXT_SERVER_VERSION= "78"
 @v419_SERVER_BOX= "cilium/ubuntu-4-19"
-@v419_SERVER_VERSION= "24"
+@v419_SERVER_VERSION= "25"
 @v49_SERVER_BOX= "cilium/ubuntu"
-@v49_SERVER_VERSION= "183"
+@v49_SERVER_VERSION= "184"