[Build-deps]: Bump google.golang.org/grpc from 1.31.0 to 1.31.1 (#1121)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.31.0 to 1.31.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.31.0...v1.31.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -44,7 +44,7 @@ require (
 	go.opencensus.io v0.22.4
 	golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	google.golang.org/grpc v1.31.0
+	google.golang.org/grpc v1.31.1
 	gopkg.in/cheggaaa/pb.v1 v1.0.27 // indirect
 )