chore(deps): update module cloud.google.com/go/asset to v1.21.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/asset	v1.20.4 -> v1.21.0

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♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[forking-renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: cli/go.sum

Command failed: go get -d -t ./...
go: -d flag is deprecated. -d=true is a no-op
go: downloading google.golang.org/api v0.230.0
go: downloading cloud.google.com/go/asset v1.21.0
go: downloading cloud.google.com/go v0.120.0
go: downloading cloud.google.com/go/longrunning v0.6.7
go: downloading google.golang.org/grpc v1.72.0
go: downloading cloud.google.com/go/accesscontextmanager v1.9.6
go: downloading cloud.google.com/go/iam v1.5.2
go: downloading cloud.google.com/go/orgpolicy v1.15.0
go: downloading cloud.google.com/go/osconfig v1.14.5
go: downloading google.golang.org/genproto/googleapis/api v0.0.0-20250425173222-7b384671a197
go: downloading google.golang.org/genproto v0.0.0-20250303144028-a0af3efb3deb
go: downloading google.golang.org/genproto/googleapis/rpc v0.0.0-20250425173222-7b384671a197
go: downloading github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.50.0
go: downloading cloud.google.com/go/auth v0.16.0
go: downloading cloud.google.com/go/auth/oauth2adapt v0.2.8
go: downloading github.com/google/s2a-go v0.1.9
go: downloading go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.60.0
go: downloading cloud.google.com/go/monitoring v1.24.0
go: downloading github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0
go: downloading github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.26.0
go: downloading github.com/googleapis/enterprise-certificate-proxy v0.3.6
go: downloading github.com/cncf/xds/go v0.0.0-20250121191232-2f005788dc42
go: downloading github.com/spiffe/go-spiffe/v2 v2.5.0
go: downloading github.com/go-jose/go-jose/v4 v4.0.4
go: downloading github.com/zeebo/errs v1.4.0
go: downloading cel.dev/expr v0.20.0
go: github.com/GoogleCloudPlatform/cloud-foundation-toolkit/cli/scorecard imports
	cloud.google.com/go/storage imports
	google.golang.org/grpc/stats/opentelemetry: ambiguous import: found package google.golang.org/grpc/stats/opentelemetry in multiple modules:
	google.golang.org/grpc v1.72.0 (/runner/cache/others/go/pkg/mod/google.golang.org/grpc@v1.72.0/stats/opentelemetry)
	google.golang.org/grpc/stats/opentelemetry v0.0.0-20241028142157-ada6787961b3 (/runner/cache/others/go/pkg/mod/google.golang.org/grpc/stats/opentelemetry@v0.0.0-20241028142157-ada6787961b3)

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