Update module github.com/nats-io/nats-server/v2 to v2.10.21

go.mod

@@ -1,6 +1,8 @@
 module github.com/giantswarm/chart-operator/v3
 
-go 1.19
+go 1.21.0
+
+toolchain go1.23.2
 
 require (
 	github.com/giantswarm/apiextensions-application v0.6.0
@@ -142,15 +144,15 @@ require (
 	go.etcd.io/etcd/api/v3 v3.5.12 // indirect
 	go.starlark.net v0.0.0-20200306205701-8dd3e2ee1dd5 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/crypto v0.24.0 // indirect
+	golang.org/x/crypto v0.27.0 // indirect
 	golang.org/x/exp v0.0.0-20231108232855-2478ac86f678 // indirect
 	golang.org/x/net v0.26.0 // indirect
 	golang.org/x/oauth2 v0.21.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.22.0 // indirect
-	golang.org/x/term v0.21.0 // indirect
-	golang.org/x/text v0.16.0 // indirect
-	golang.org/x/time v0.5.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/term v0.24.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
+	golang.org/x/time v0.6.0 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240318140521-94a12d6c2237 // indirect
 	google.golang.org/grpc v1.62.1 // indirect
@@ -180,7 +182,7 @@ replace (
 	github.com/docker/docker => github.com/moby/moby v20.10.27+incompatible
 	github.com/gin-gonic/gin v1.4.0 => github.com/gin-gonic/gin v1.9.0
 	github.com/imdario/mergo => github.com/imdario/mergo v0.3.13
-	github.com/nats-io/nats-server/v2 => github.com/nats-io/nats-server/v2 v2.10.16
+	github.com/nats-io/nats-server/v2 => github.com/nats-io/nats-server/v2 v2.10.21
 	golang.org/x/net => golang.org/x/net v0.26.0
 	google.golang.org/grpc => google.golang.org/grpc v1.64.0
 )