Align default Kubernetes version with AKS service

[pjlewisuk]

Is your feature request related to a problem? Please describe.
Default Kubernetes version in AKS is now 1.27.7, need to align AKS Construction to this

Describe the solution you'd like
Update the default version to 1.27.7

Describe alternatives you've considered
n/a

Additional context
n/a

[github-actions]

Issue smells stale, no activity for 30 days. Stale Label will be removed if the issue is updated, otherwise closed in a month.

[deepdolphin]

Bumped main branch to AKS 1.28.5, but still waiting for Bicep and new Helper application to be build + deployed.

[pjlewisuk]

Version bumped to 1.29.7 in #705. Released in release 0.10.7.