runtime: bump runtime spec version

runtime/src/lib.rs

@@ -83,7 +83,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     spec_name: create_runtime_str!("joystream-node"),
     impl_name: create_runtime_str!("joystream-node"),
     authoring_version: 9,
-    spec_version: 12,
+    spec_version: 13,
     impl_version: 0,
     apis: crate::runtime_api::EXPORTED_RUNTIME_API_VERSIONS,
     transaction_version: 1,