fix(service-proxy): rm buffer size as hardcoded annotation

[kengou]

Removed nginx.ingress.kubernetes.io/proxy-buffer-size: 32k from

greenhouse-extensions/service-proxy/charts/1.0.0/service-proxy/templates/oauth2-proxy-ingress.yaml

Lines 10 to 14 in 2635b53

	annotations:
	{{- toYaml . | nindent 4 }}
	nginx.ingress.kubernetes.io/proxy-buffer-size: 32k
	nginx.ingress.kubernetes.io/ssl-redirect: "true"
	{{- end }}

as an annotation from ingress-template.
The same annotation already coming from values.yaml and flux is failing with the deployment.

greenhouse-extensions/service-proxy/charts/1.0.0/service-proxy/values.yaml

Lines 35 to 39 in 2635b53

	ingress:
	className: ""
	annotations:
	nginx.ingress.kubernetes.io/proxy-buffer-size: 32k
	kubernetes.io/tls-acme: "true"

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