build(deps): 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: indirect
...

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

go.mod

@@ -20,35 +20,31 @@ require (
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/mock v1.4.4
-	github.com/google/btree v1.0.0 // indirect
+	github.com/golang/mock v1.6.0
 	github.com/gorilla/websocket v1.4.2 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway v1.9.0 // indirect
 	github.com/hashicorp/go-version v1.6.0
 	github.com/jonboulle/clockwork v0.1.0 // indirect
 	github.com/lestrrat-go/file-rotatelogs v2.4.0+incompatible
 	github.com/lestrrat-go/strftime v1.0.6 // indirect
-	github.com/mattn/go-isatty v0.0.13 // indirect
 	github.com/onsi/ginkgo/v2 v2.3.1
 	github.com/onsi/gomega v1.22.1
 	github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8
 	github.com/pingcap/errors v0.11.1
 	github.com/pingcap/tipb v0.0.0-20190226124958-833c2ffd2fe7
 	github.com/prometheus/client_golang v1.11.1
-	github.com/remyoudompheng/bigfft v0.0.0-20190321074620-2f0d2b0e0001 // indirect
 	github.com/shirou/gopsutil v2.20.9+incompatible
 	github.com/shopspring/decimal v1.3.1
 	github.com/soheilhy/cmux v0.1.4 // indirect
-	github.com/stretchr/testify v1.8.1
+	github.com/stretchr/testify v1.8.3
 	github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8 // indirect
 	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
 	go.uber.org/atomic v1.4.0
 	go.uber.org/multierr v1.1.0 // indirect
 	go.uber.org/zap v1.10.0
-	golang.org/x/time v0.0.0-20181108054448-85acf8d2951c // indirect
-	google.golang.org/grpc v1.21.0 // indirect
+	golang.org/x/time v0.3.0
+	google.golang.org/grpc v1.56.3 // indirect
 	gopkg.in/ini.v1 v1.42.0
 )