Bump google.golang.org/grpc from 1.32.0 to 1.56.1

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.32.0 to 1.56.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.32.0...v1.56.1)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -4,23 +4,23 @@ go 1.15
 
 require (
 	github.com/dgryski/go-metro v0.0.0-20200812162917-85c65e2d0165 // indirect
-	github.com/golang/mock v1.4.4
-	github.com/golang/protobuf v1.4.2
-	github.com/google/go-cmp v0.5.3
+	github.com/golang/mock v1.6.0
+	github.com/golang/protobuf v1.5.3
+	github.com/google/go-cmp v0.5.9
 	github.com/gorilla/websocket v1.4.2
 	github.com/lucas-clemente/quic-go v0.18.1
 	github.com/miekg/dns v1.1.31
 	github.com/pires/go-proxyproto v0.2.0
 	github.com/seiflotfy/cuckoofilter v0.0.0-20200511222245-56093a4d3841
-	github.com/stretchr/testify v1.8.1
+	github.com/stretchr/testify v1.8.3
 	github.com/xiaokangwang/VSign v0.0.0-20200828155424-dc1c86b73fbf
 	github.com/xtls/go v0.0.0-20201007031018-d42c13c57942
 	go.starlark.net v0.0.0-20201006213952-227f4aabceb5
-	golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0
-	golang.org/x/net v0.0.0-20201006153459-a7d1128ccaa0
-	golang.org/x/sync v0.0.0-20200930132711-30421366ff76
-	golang.org/x/sys v0.0.0-20201006155630-ac719f4daadf
-	google.golang.org/grpc v1.32.0
-	google.golang.org/protobuf v1.25.0
+	golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa
+	golang.org/x/net v0.9.0
+	golang.org/x/sync v0.1.0
+	golang.org/x/sys v0.7.0
+	google.golang.org/grpc v1.56.1
+	google.golang.org/protobuf v1.30.0
 	h12.io/socks v1.0.1
 )