chore: use rbac.authorization.k8s.io/v1 for metrics-server

[jackfrancis]

Reason for Change:

rbac.authorization.k8s.io/v1beta1 is deprecated, and will be removed in the 1.22 release.

This PR uses the current rbac.authorization.k8s.io/v1 API version for metrics-server.

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [jackfrancis]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Merging #4367 (9a4d1cd) into master (3445c1b) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4367      +/-   ##
==========================================
- Coverage   72.08%   72.04%   -0.04%     
==========================================
  Files         141      141              
  Lines       21667    21631      -36     
==========================================
- Hits        15618    15584      -34     
+ Misses       5097     5096       -1     
+ Partials      952      951       -1     

Impacted Files	Coverage Δ
pkg/engine/templates_generated.go	43.31% <ø> (-0.25%)	⬇️
pkg/api/addons.go	98.01% <0.00%> (-0.03%)	⬇️
pkg/engine/artifacts.go	98.88% <0.00%> (-0.03%)	⬇️
pkg/api/k8s_versions.go	100.00% <0.00%> (ø)
pkg/api/vlabs/validate.go	81.83% <0.00%> (+0.05%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3445c1b...9a4d1cd. Read the comment docs.