Bug 11124: QA Follow-up adding optional dependency HTTPD::Bench::ApacheBench

Bug 11124: QA Follow-up adding optional dependency HTTPD::Bench::ApacheBench

This dependency is used in load testing (misc/load_testing/*)

Test plan:
Check if you see the dependency listed on About/Perl modules.
Verify if the version information is correct.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit f90cca4831dc90c74f4b6c18e415b1cce361fdb2)
Signed-off-by: Fridolin SOMERS <fridolin.somers@biblibre.com>