fix(deps): update module cloud.google.com/go/kms to v1.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/kms	v1.10.1 -> v1.20.0

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[renovate]

ℹ Artifact update notice

File name: gcpkms/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):

• 9 additional dependencies were updated
• The go directive was updated for compatibility reasons

Details:

Package	Change
go	1.19 -> 1.23.1
google.golang.org/genproto	v0.0.0-20230410155749-daa745c078e1 -> v0.0.0-20240903143218-8af14fe29dc1
google.golang.org/protobuf	v1.33.0 -> v1.34.2
github.com/golang/protobuf	v1.5.3 -> v1.5.4
github.com/google/go-cmp	v0.5.9 -> v0.6.0
github.com/googleapis/enterprise-certificate-proxy	v0.2.3 -> v0.3.4
github.com/googleapis/gax-go/v2	v2.7.1 -> v2.13.0
golang.org/x/crypto	v0.21.0 -> v0.27.0
golang.org/x/net	v0.23.0 -> v0.29.0
golang.org/x/oauth2	v0.7.0 -> v0.23.0