chore: bump just ubuntu for vm_images in CI

[bartsmykla]

Signed-off-by: Bart Smykla [email protected]

Checklist prior to review

• Link to docs PR or issue --
• Link to UI issue or PR --
• Is the issue worked on linked? --
• The PR does not hardcode values that might break projects that depend on kuma (e.g. "kumahq" as a image registry) --
• The PR will work for both Linux and Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Unit Tests --
• E2E Tests --
• Manual Universal Tests --
• Manual Kubernetes Tests --
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? --
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests?

[bartsmykla]

I'm closing it as it requires changes in our new tproxy installation (upstream dns chain) from 9e30f57 and it's not worth implementing before moving the code from kuma-net here