graphene: Lower 1.12 version dependency to 1.11

Author: sdroege

graphene/sys/Cargo.toml

@@ -50,7 +50,7 @@ name = "graphene-gobject-1.0"
 version = "1.10"
 
 [package.metadata.system-deps.graphene_gobject_1_0.v1_12]
-version = "1.12"
+version = "1.11"
 
 [package.metadata.docs.rs]
 rustc-args = ["--cfg", "docsrs"]