Get t/lib/croak/class to skip until v5.39.1

This was designed to fail starting in 5.39.0, but we need to get things
working for the nonce.

t/lib/croak/class

@@ -101,7 +101,7 @@ Execution of - aborted due to compilation errors.
 # This test is known to leak: see GH #20812. Skip it for now so that ASAN
 # smokes don't fail. Start failing again on the next development branch so
 # that the issue isn't forgotten
-# SKIP ? $] < 5.039
+# SKIP ? $] < 5.039001
 use strict;
 no warnings 'experimental::class';
 use feature 'class';