bugc: fix offset comparison type in context test

Cast Format.Program.Instruction offset to number for
comparison, since the type is Value (string | number |
bigint).

Author: gnidan

packages/bugc/src/evmgen/call-contexts.test.ts

@@ -174,7 +174,9 @@ code {
     // Invoke JUMP offset should be less than
     // return JUMPDEST offset (caller comes first
     // in bytecode)
-    expect(invokeJump.offset).toBeLessThan(returnJumpdest.offset);
+    expect(Number(invokeJump.offset)).toBeLessThan(
+      Number(returnJumpdest.offset),
+    );
   });
 
   describe("void function calls", () => {