Fix error testing because message got more verbose

S02-types/declare.t

@@ -113,7 +113,7 @@ plan 70;
 #?rakudo.jvm todo "RT #126526"
 {
  throws-like { my int $namcu; $namcu = 2**100 }, Exception,
-    message => 'Cannot unbox 101 bit wide bigint into native integer',
+    message => / 'Cannot unbox 101 bit wide bigint into native integer' /,
     "Assign big bigint to native won't overflow silently";
 }