runtime: Bump recursion limit for graph-runtime-test

Author: incrypto32

runtime/test/src/lib.rs

@@ -1,4 +1,6 @@
 #![cfg(test)]
+// Deep async nesting in tests exceeds the default limit (128) on newer rustc versions.
+#![recursion_limit = "256"]
 pub mod common;
 mod test;