the_platinum_searcher 1.6.5

With v1.6.5, the_platinum_searcher now returns 0 on a positive search
result and 1 on a negative search result (i.e. 0=match found, 1=no
matches found).
the_platinum_searcher: update 1.6.5 bottle.

Closes #30714.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
the_platinum_searcher: slightly shorten test.