Bump google.golang.org/grpc from 1.40.0 to 1.56.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.40.0 to 1.56.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.40.0...v1.56.0)

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

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

go.mod

@@ -5,8 +5,8 @@ go 1.16
 require (
 	github.com/99designs/gqlgen v0.14.0
 	github.com/cristalhq/jwt/v3 v3.1.0
-	github.com/golang/protobuf v1.5.2
-	github.com/google/go-cmp v0.5.6
+	github.com/golang/protobuf v1.5.3
+	github.com/google/go-cmp v0.5.9
 	github.com/imdario/mergo v0.3.15
 	github.com/matr-builder/matr v0.0.0-20210309214705-195229246b38
 	github.com/okta/okta-jwt-verifier-golang v1.1.1
@@ -19,7 +19,7 @@ require (
 	github.com/tidwall/buntdb v1.3.0
 	github.com/tidwall/gjson v1.14.3
 	github.com/vektah/gqlparser/v2 v2.2.0
-	google.golang.org/grpc v1.40.0
+	google.golang.org/grpc v1.56.0
 	google.golang.org/protobuf v1.30.0
 	gorm.io/driver/postgres v1.1.1
 	gorm.io/gorm v1.21.15