Bump google.golang.org/grpc from 1.45.0 to 1.56.3

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.45.0 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.45.0...v1.56.3)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-version: 1.56.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

go.mod

@@ -7,13 +7,12 @@ require (
 	github.com/brocaar/lorawan v0.0.0-20191105091820-9ed596703a6c
 	github.com/eclipse/paho.mqtt.golang v1.2.0
 	github.com/gofrs/uuid v3.2.0+incompatible
-	github.com/golang/protobuf v1.5.2
-	github.com/pkg/errors v0.8.1
+	github.com/golang/protobuf v1.5.3
+	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v0.9.3
 	github.com/sirupsen/logrus v1.4.2
 	github.com/smartystreets/assertions v1.0.0 // indirect
 	github.com/spf13/cobra v0.0.5
 	github.com/spf13/viper v1.5.0
-	golang.org/x/text v0.3.2 // indirect
-	google.golang.org/grpc v1.45.0
+	google.golang.org/grpc v1.56.3
 )