bk: use ubuntu 22.04 (#5123)

(cherry picked from commit fae7420)

Author: v1v

.buildkite/pipeline.package.mbp.yml

@@ -1,9 +1,8 @@
 # yaml-language-server: $schema=https://raw.githubusercontent.com/buildkite/pipeline-schema/main/schema.json
 name: "fleet server package mbp"
 env:
-  REPO: 'fleet-server'
-  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