build(deps): Bump google.golang.org/grpc from 1.81.0 to 1.81.1 in /envoy (#1476)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.81.0 to 1.81.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.81.0...v1.81.1)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-version: 1.81.1
  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>

Author: dependabot[bot]

envoy/go.mod

@@ -16,7 +16,7 @@ require (
 	go.opentelemetry.io/proto/otlp v1.10.0
 	google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171
-	google.golang.org/grpc v1.81.0
+	google.golang.org/grpc v1.81.1
 	google.golang.org/protobuf v1.36.11
 )
 

envoy/go.sum

@@ -54,8 +54,8 @@ google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171 h1:
 google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171/go.mod h1:M5krXqk4GhBKvB596udGL3UyjL4I1+cTbK0orROM9ng=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 h1:ggcbiqK8WWh6l1dnltU4BgWGIGo+EVYxCaAPih/zQXQ=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.81.0 h1:W3G9N3KQf3BU+YuCtGKJk0CmxQNbAISICD/9AORxLIw=
-google.golang.org/grpc v1.81.0/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
+google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
+google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=