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Increase CPU limits for cert-manager

We get frequent CPUThrottlingHigh alerts like this for the cert-manager pod on oas.gh:

Labels
alertname = CPUThrottlingHigh
container = cert-manager
namespace = cert-manager
pod = cert-manager-7d75b8755c-97fmv
prometheus = oas/kube-prometheus-stack-prometheus
severity = info
Annotations
description = 27.49% throttling of CPU in namespace cert-manager for container cert-manager in pod cert-manager-7d75b8755c-97fmv.
runbook_url = https://github.com/kubernetes-monitoring/kubernetes-mixin/tree/master/runbook.md#alert-name-cputhrottlinghigh
summary = Processes experience elevated CPU throttling.
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