fix(deps): update module google.golang.org/grpc to v1.64.0

Author: renovate[bot]

go.mod

@@ -5,8 +5,5 @@ go 1.13
 require (
 	github.com/depscloud/api v0.1.19
 	github.com/ghodss/yaml v1.0.0
-	golang.org/x/net v0.0.0-20200707034311-ab3426394381 // indirect
-	golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed // indirect
-	golang.org/x/text v0.3.3 // indirect
-	google.golang.org/grpc v1.33.2
+	google.golang.org/grpc v1.64.0
 )