Bump google.golang.org/grpc from 1.53.0 to 1.56.3 in /docsgen

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.53.0 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.53.0...v1.56.3)

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

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

docsgen/go.mod

@@ -39,7 +39,7 @@ require (
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/gobuffalo/pop/v5 v5.3.3 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/h2non/filetype v1.1.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
@@ -94,9 +94,9 @@ require (
 	golang.org/x/sys v0.13.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
 	golang.org/x/tools v0.6.0 // indirect
-	google.golang.org/genproto v0.0.0-20230110181048-76db0878b65f // indirect
-	google.golang.org/grpc v1.53.0 // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
+	google.golang.org/grpc v1.56.3 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
 	gopkg.in/ini.v1 v1.66.2 // indirect
 	gopkg.in/src-d/go-billy.v4 v4.3.2 // indirect
 	gopkg.in/src-d/go-git.v4 v4.13.1 // indirect