fix: use pdb policy/v1 apiversion when possible

fix imgproxy#76

Author: thibaultserti

imgproxy/templates/pod-disruption-budget.yaml

@@ -1,6 +1,10 @@
 {{- with .Values.resources.podDisruptionBudget -}}
 {{- if .enabled }}
+{{- if .Capabilities.APIVersions.Has "policy/v1" -}}
+apiVersion: policy/v1
+{{- else}}
 apiVersion: policy/v1beta1
+{{- end }}
 kind: PodDisruptionBudget
 metadata:
   name: {{ template "imgproxy.fullname" $ }}-pdb