Fix chart empty annotations in APIService

[danielllek]

What this PR does / why we need it:

Latest chart version adds empty (null) annotations to APIService object.

This causes problem (constant diff) when metrics servers is deployed from ArgoCD using helm chart.

What causes this:

1. helm template produces such yaml

---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  name: v1beta1.metrics.k8s.io
  labels:
    helm.sh/chart: metrics-server-3.13.0
    app.kubernetes.io/name: metrics-server
    app.kubernetes.io/instance: test
    app.kubernetes.io/version: "0.8.0"
    app.kubernetes.io/managed-by: Helm
spec:
  group: metrics.k8s.io
  groupPriorityMinimum: 100
  insecureSkipTLSVerify: true
  service:
    name: test-metrics-server
    namespace: default
    port: 443
  version: v1beta1
  versionPriority: 100

1. After applying this yaml to Kubernetes, api server removes empty annotations:
2. ArgoCD sees diff and tries to apply again and cycle repeats.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[linux-foundation-easycla]

• ✅login: danielllek / name: Daniel Fenert / (cba9271)

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