build(deps): Bump istio.io/client-go from 1.11.4 to 1.15.2

Bumps [istio.io/client-go](https://github.com/istio/client-go) from 1.11.4 to 1.15.2.
- [Release notes](https://github.com/istio/client-go/releases)
- [Commits](istio/client-go@v1.11.4...v1.15.2)

---
updated-dependencies:
- dependency-name: istio.io/client-go
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -30,8 +30,8 @@ require (
 	golang.org/x/tools v0.2.0
 	google.golang.org/grpc v1.48.0
 	google.golang.org/protobuf v1.28.1
-	istio.io/api v0.0.0-20211012192923-310f2a3f3c76
-	istio.io/client-go v1.11.4
+	istio.io/api v0.0.0-20221005164339-97dc20dc0ff3
+	istio.io/client-go v1.15.2
 	k8s.io/api v0.25.3
 	k8s.io/apiextensions-apiserver v0.25.3
 	k8s.io/apimachinery v0.25.3
@@ -132,13 +132,12 @@ require (
 	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
 	gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20220519153652-3a47de7e79bd // indirect
+	google.golang.org/genproto v0.0.0-20220628213854-d9e0b6570c03 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	istio.io/gogo-genproto v0.0.0-20210113155706-4daf5697332f // indirect
 	k8s.io/component-base v0.25.3 // indirect
 	k8s.io/gengo v0.0.0-20211129171323-c02415ce4185 // indirect
 	k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect