Bump google.golang.org/grpc from 1.21.0 to 1.56.3

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.21.0 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.21.0...v1.56.3)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
...

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

go.mod

@@ -21,41 +21,32 @@ require (
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/gogo/protobuf v1.2.1 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/google/btree v1.0.0 // indirect
 	github.com/google/go-jsonnet v0.12.1 // indirect
 	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf // indirect
 	github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d // indirect
 	github.com/gregjones/httpcache v0.0.0-20190212212710-3befbb6ad0cc // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway v1.9.0 // indirect
-	github.com/hashicorp/golang-lru v0.5.1 // indirect
 	github.com/imdario/mergo v0.3.5 // indirect
 	github.com/json-iterator/go v0.0.0-20180701071628-ab8a2e0c74be // indirect
 	github.com/k0kubun/colorstring v0.0.0-20150214042306-9440f1994b88 // indirect
-	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/mailru/easyjson v0.0.0-20190403194419-1ea4449da983 // indirect
 	github.com/malexdev/utfutil v0.0.0-20180510171754-00c8d4a8e7a8 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
 	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
-	github.com/pkg/errors v0.8.1 // indirect
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cobra v0.0.4
 	github.com/spf13/pflag v1.0.3
-	github.com/stretchr/testify v1.3.0
+	github.com/stretchr/testify v1.8.3
 	github.com/vmihailenco/msgpack v4.0.4+incompatible // indirect
 	github.com/xanzy/ssh-agent v0.2.1 // indirect
 	github.com/yudai/gojsondiff v0.0.0-20180504020246-0525c875b75c // indirect
 	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // indirect
 	github.com/yudai/pp v2.0.1+incompatible // indirect
-	golang.org/x/text v0.3.8 // indirect
-	golang.org/x/time v0.0.0-20161028155119-f51c12702a4d // indirect
-	google.golang.org/appengine v1.6.0 // indirect
-	google.golang.org/genproto v0.0.0-20190530194941-fb225487d101 // indirect
-	google.golang.org/grpc v1.21.0 // indirect
+	google.golang.org/grpc v1.56.3 // indirect
 	gopkg.in/inf.v0 v0.9.0 // indirect
 	gopkg.in/square/go-jose.v2 v2.3.1 // indirect
 	gopkg.in/src-d/go-billy.v4 v4.3.0 // indirect