Update module github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring to v0.81.0 #883

Job	Run time
linting (lint_jsonnet)	9s
editorconfig	5s
linting (lint_yaml)	7s
golden (defaults)	17s
linting (lint_adoc)	6s
test (defaults)	19s
golden (openshift4)	19s
test (openshift4)	19s
golden (cephfs)	19s
test (cephfs)	21s
golden (rbd-extra-storageclass)	19s
test (rbd-extra-storageclass)	22s
	3m 2s

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