CLOUD-727: Bump go.nhat.io/grpcmock from 0.30.0 to 0.31.0 (#952)

Bumps [go.nhat.io/grpcmock](https://github.com/nhatthm/grpcmock) from 0.30.0 to 0.31.0.
- [Release notes](https://github.com/nhatthm/grpcmock/releases)
- [Commits](nhatthm/grpcmock@v0.30.0...v0.31.0)

---
updated-dependencies:
- dependency-name: go.nhat.io/grpcmock
  dependency-version: 0.31.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/onsi/gomega v1.37.0
 	github.com/pkg/errors v0.9.1
 	github.com/sjmudd/stopwatch v0.1.1
-	go.nhat.io/grpcmock v0.30.0
+	go.nhat.io/grpcmock v0.31.0
 	go.uber.org/zap v1.27.0
 	golang.org/x/sync v0.15.0
 	golang.org/x/text v0.26.0
@@ -42,6 +42,7 @@ require (
 	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/google/btree v1.1.3 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.3.2 // indirect
 	github.com/minio/crc64nvme v1.0.1 // indirect
 	github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c // indirect
 	github.com/tinylib/msgp v1.3.0 // indirect
@@ -78,7 +79,6 @@ require (
 	github.com/google/pprof v0.0.0-20250403155104-27863c87afa6 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 // indirect
-	github.com/grpc-ecosystem/go-grpc-middleware v1.4.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.0
 	github.com/iancoleman/orderedmap v0.3.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect