Regenerate kernel strong-mode baseline files

pkg/kernel/testcases/strong-mode/arithmetic.baseline.txt

Index: pkg/kernel/testcases/strong-mode/arithmetic.baseline.txt
diff --git a/pkg/kernel/testcases/strong-mode/arithmetic.baseline.txt b/pkg/kernel/testcases/strong-mode/arithmetic.baseline.txt
index e2b593f36ebd17dfcd260c5db7b80dfb88aa01fa..0eac1ce9b98d04f792c68bf22d2f2f7234949f9d 100644
--- a/pkg/kernel/testcases/strong-mode/arithmetic.baseline.txt
+++ b/pkg/kernel/testcases/strong-mode/arithmetic.baseline.txt
@@ -14,5 +14,5 @@ static method loop(core::List<dynamic> xs) → void {
 static method main() → dynamic {
   self::foo(4, 5);
   self::foo(6, 7);
-  self::loop(<core::String>["dfg"]);
+  self::loop(<dynamic>["dfg"]);
 }