Update tests to match the changed text

Author: tbkka

test/Casting/CastTraps.swift.gyb

@@ -107,9 +107,10 @@ CastTrapsTestSuite.test("${t1}__${t2}")
 protocol P2 {}
 if #available(SwiftStdlib 5.5, *) {
 CastTrapsTestSuite.test("Unexpected null")
-  .crashOutputMatches("Found unexpected null pointer value while trying to cast value of type '")
+  .crashOutputMatches("Non-Optional value of type '")
   .crashOutputMatches("Foo'")
-  .crashOutputMatches(" to '")
+  .crashOutputMatches("holds a null pointer")
+  .crashOutputMatches("(Detected while casting to '")
   .crashOutputMatches("P2'")
   .code
 {
@@ -127,9 +128,9 @@ CastTrapsTestSuite.test("Unexpected null")
 #if _runtime(_ObjC)
 if #available(SwiftStdlib 5.5, *) {
 CastTrapsTestSuite.test("Unexpected Obj-C null")
-  .crashOutputMatches("Found unexpected null pointer value while trying to cast value of type '")
-  .crashOutputMatches("NSObject'")
-  .crashOutputMatches(" to '")
+  .crashOutputMatches("Non-Optional value of type 'NSObject'")
+  .crashOutputMatches("holds a null pointer")
+  .crashOutputMatches("(Detected while casting to '")
   .crashOutputMatches("P2'")
   .code
 {