fix(deps): update module github.com/hashicorp/vault/api to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/hashicorp/vault/api	v1.20.0 -> v1.21.0

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[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):

• 9 additional dependencies were updated

Details:

Package	Change
github.com/go-jose/go-jose/v4	v4.0.5 -> v4.1.1
github.com/hashicorp/go-retryablehttp	v0.7.7 -> v0.7.8
github.com/hashicorp/go-secure-stdlib/parseutil	v0.1.8 -> v0.2.0
github.com/hashicorp/go-sockaddr	v1.0.6 -> v1.0.7
golang.org/x/crypto	v0.39.0 -> v0.40.0
golang.org/x/net	v0.41.0 -> v0.42.0
golang.org/x/sys	v0.33.0 -> v0.34.0
golang.org/x/text	v0.26.0 -> v0.27.0
golang.org/x/time	v0.5.0 -> v0.12.0