chore(deps): bump go.etcd.io/etcd/client/pkg/v3 from 3.5.20 to 3.5.21 (#6678)

Bumps [go.etcd.io/etcd/client/pkg/v3](https://github.com/etcd-io/etcd) from 3.5.20 to 3.5.21.
- [Release notes](https://github.com/etcd-io/etcd/releases)
- [Commits](https://github.com/etcd-io/etcd/compare/v3.5.20...v3.5.21)

---
updated-dependencies:
- dependency-name: go.etcd.io/etcd/client/pkg/v3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -153,7 +153,7 @@ require (
 	github.com/tikv/client-go/v2 v2.0.7
 	github.com/ydb-platform/ydb-go-sdk-auth-environ v0.5.0
 	github.com/ydb-platform/ydb-go-sdk/v3 v3.104.1
-	go.etcd.io/etcd/client/pkg/v3 v3.5.20
+	go.etcd.io/etcd/client/pkg/v3 v3.5.21
 	go.uber.org/atomic v1.11.0
 	golang.org/x/sync v0.12.0
 	google.golang.org/grpc/security/advancedtls v1.0.0