Storable's t/malice.t now needs to use a minor version >4 ahead for testing.

Storable's t/malice.t now needs to use a minor version >4 ahead for testing.

The "safety margin" of 4 has been used up, now that Storable 2.25 can read
v2.8 files, but only writes out v2.4 on 5.004. All tests now pass on 5.004
(albeit with a bunch of warnings about ambiguous use of barewords, which are
no longer warnings).

Also, update $Test::Builder::Level to make diagnosing failing tests easier.