[9.0](backport #5123) bk: use ubuntu 22.04 (#5134)

Author: mergify[bot]

.buildkite/pipeline.package.mbp.yml

@@ -3,8 +3,8 @@ name: "fleet server package mbp"
 env:
   REPO: 'fleet-server'
   DOCKER_REGISTRY: "docker.elastic.co"
-  IMAGE_UBUNTU_X86_64: "family/core-ubuntu-2004"
-  IMAGE_UBUNTU_ARM_64: "core-ubuntu-2004-aarch64"
+  IMAGE_UBUNTU_X86_64: "family/core-ubuntu-2204"
+  IMAGE_UBUNTU_ARM_64: "core-ubuntu-2204-aarch64"
 
 # This section is used to define the plugins that will be used in the pipeline.
 # See https://buildkite.com/docs/pipelines/integrations/plugins/using#using-yaml-anchors-with-plugins