[prometheus-statsd-exporter] - add conditional for hpa apiVersion

[tylenwells]

What this PR does / why we need it

autoscaling/v2beta1 api for horizontalPodAutoscalers was removed in k8s 1.25
This PR adds a conditional to use autoscaling/v2 API version if the k8s version of your cluster is 1.25 or greater.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer

@scDisorder - @-mentioning you per the instructions above. Please review when you have the time, thank you!

Checklist

• DCO signed
• Chart Version bumped
• Title of the PR starts with chart name (e.g. [prometheus-couchdb-exporter])

[zeritti]

Thank you, @tylenwells, for your PR. Please, see my comment below.

[oshaughnessy]

i'm running into issues with autoscaling/v2beta1 -- i see warnings in my K8S 1.25 clusters and failures in 1.26. i'd love to see a solution merged in, whether or not the code is optimal. not ideal, perhaps, but how about approving & merging as-is and updating with better code as a separate PR? :-)

[oshaughnessy]

@zeritti, that's a nice change. thanks for giving this some attention!

[tylenwells]

Leaving a note here for anyone who comes across this:

This change allows for the updated apiVersion to be used, but doesn't account for the change in spec formatting for the new apiVersion. #3681 takes care of that.

old ver:

metrics:
   - type: Resource
      resource:
        name: cpu
        targetAverageUtilization:  {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}

new ver:

metrics:
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}