fix(deps): update module cloud.google.com/go/monitoring to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/monitoring	v1.16.3 -> v1.21.0

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[github-actions]

@renovate[bot] Image is available for testing. docker pull stakater/ingressmonitorcontroller:SNAPSHOT-PR-578-8a1f621b

[renovate]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 20 additional dependencies were updated

Details:

Package	Change
github.com/go-logr/logr	v1.4.1 -> v1.4.2
github.com/stretchr/testify	v1.8.4 -> v1.9.0
google.golang.org/api	v0.149.0 -> v0.193.0
google.golang.org/genproto/googleapis/api	v0.0.0-20231120223509-83a465c0220f -> v0.0.0-20240814211410-ddb44dafa142
github.com/cespare/xxhash/v2	v2.2.0 -> v2.3.0
github.com/golang/protobuf	v1.5.3 -> v1.5.4
github.com/google/s2a-go	v0.1.7 -> v0.1.8
github.com/googleapis/gax-go/v2	v2.12.0 -> v2.13.0
golang.org/x/crypto	v0.21.0 -> v0.26.0
golang.org/x/net	v0.23.0 -> v0.28.0
golang.org/x/oauth2	v0.16.0 -> v0.22.0
golang.org/x/sync	v0.6.0 -> v0.8.0
golang.org/x/sys	v0.18.0 -> v0.24.0
golang.org/x/term	v0.18.0 -> v0.23.0
golang.org/x/text	v0.14.0 -> v0.17.0
golang.org/x/time	v0.0.0-20220210224613-90d013bbcef8 -> v0.6.0
google.golang.org/genproto	v0.0.0-20231211222908-989df2bf70f3 -> v0.0.0-20240814211410-ddb44dafa142
google.golang.org/genproto/googleapis/rpc	v0.0.0-20231212172506-995d672761c0 -> v0.0.0-20240814211410-ddb44dafa142
google.golang.org/grpc	v1.61.0 -> v1.65.0
google.golang.org/protobuf	v1.33.0 -> v1.34.2