chore: bump prometheus-adapter

[hectorj2f]

What type of PR is this?

Bug
What this PR does/ why we need it:

There were some error messages in prometheus-adapter that appeared during our MWT. Those are fixed as part of v0.8.3 prometheus-adapter version.

Which issue(s) this PR fixes:

Issue: https://jira.d2iq.com/browse/D2IQ-74004
Special notes for your reviewer:

Does this PR introduce a user-facing change?:

prometheus-adapter: bump to latest version v0.8.3
* Fix authorizer webhook panic by bumping apiserver dependencies #362
* Add NOTICE to comply with the CNCF rules #359
* Populate metric selector for custom metrics #348
* Fix apiserver panics by bump to k8s 1.20, go 1.15 #352
* Make NodeMetrics and PodMetrics APIs match K8s conventions #344

Checklist

• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

[joejulian]

@mesosphere-mergebot backport release/3.3