Porting/Maintainers.pm: deterministic output order

[perl #116509]

Change Porting/Maintainers.pm to output tests in the same order each
time t/porting/maintainers.t is run.

Before, it was difficult to see whether editing t/porting/maintainers.t
didn't have any adverse effects. The random output order could be seen
with

    diff <(./perl t/porting/maintainers.t) <(./perl t/porting/maintainers.t)

Also set Porting/Maintainers.pm version to 0.09.