Update module github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring to v0.81.0 #870

Job	Run time
editorconfig	2s
test (defaults)	24s
golden (defaults)	22s
test (openshift4)	19s
linting (lint_jsonnet)	8s
test (cephfs)	19s
golden (openshift4)	20s
test (rbd-extra-storageclass)	25s
linting (lint_yaml)	4s
golden (cephfs)	22s
linting (lint_adoc)	6s
golden (rbd-extra-storageclass)	19s
	3m 10s

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