build(deps): bump github.com/envoyproxy/go-control-plane/envoy

Bumps [github.com/envoyproxy/go-control-plane/envoy](https://github.com/envoyproxy/go-control-plane) from 1.37.1-0.20260304210048-a81710db7097 to 1.39.0.
- [Release notes](https://github.com/envoyproxy/go-control-plane/releases)
- [Changelog](https://github.com/envoyproxy/go-control-plane/blob/main/CHANGELOG.md)
- [Commits](https://github.com/envoyproxy/go-control-plane/commits/envoy/v1.39.0)

---
updated-dependencies:
- dependency-name: github.com/envoyproxy/go-control-plane/envoy
  dependency-version: 1.39.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

examples/envoy-ext-auth/go.mod

@@ -3,7 +3,7 @@ module github.com/envoyproxy/gateway-grcp-ext-auth
 go 1.26.6
 
 require (
-	github.com/envoyproxy/go-control-plane/envoy v1.37.1-0.20260304210048-a81710db7097
+	github.com/envoyproxy/go-control-plane/envoy v1.39.0
 	github.com/golang/protobuf v1.5.4
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa
 	google.golang.org/grpc v1.83.0

examples/envoy-ext-auth/go.sum

@@ -2,8 +2,8 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2 h1:aBangftG7EVZoUb69Os8IaYg++6uMOdKK83QtkkvJik=
 github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2/go.mod h1:qwXFYgsP6T7XnJtbKlf1HP8AjxZZyzxMmc+Lq5GjlU4=
-github.com/envoyproxy/go-control-plane/envoy v1.37.1-0.20260304210048-a81710db7097 h1:Ou9X6qsPOiDOsQgaboj3jlCE5ZYngdYeSVDKBcT95QE=
-github.com/envoyproxy/go-control-plane/envoy v1.37.1-0.20260304210048-a81710db7097/go.mod h1:237/ZQHepDd4v5BjpRNFI2mMG7WEBd+mQnt8jwbqrnk=
+github.com/envoyproxy/go-control-plane/envoy v1.39.0 h1:1uwRDYPYG8BIBU9Mj1sUAebNmlM6beu/ZKKweSLDxk8=
+github.com/envoyproxy/go-control-plane/envoy v1.39.0/go.mod h1:5e4ylfTZO723MEEFsCpSW4ZEBWR8mwkEyXfwJBTCZ9c=
 github.com/envoyproxy/protoc-gen-validate v1.3.3 h1:MVQghNeW+LZcmXe7SY1V36Z+WFMDjpqGAGacLe2T0ds=
 github.com/envoyproxy/protoc-gen-validate v1.3.3/go.mod h1:TsndJ/ngyIdQRhMcVVGDDHINPLWB7C82oDArY51KfB0=
 github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=