benchmarks/rubygem-gitlab-derailed_benchmarks: Change RUN_DEPENDS from rubygem-get_process_mem to rubygem-get_process_mem0

• Fix version requirement of RUN_DEPENDS
• Bump PORTREVISION for dependency change

from gitlab-derailed_benchmarks.gemspec:

s.add_runtime_dependency(%q<get_process_mem>.freeze, ["~> 0".freeze])

Note that this port still does not pass stage-qa.

> Running Q/A tests (stage-qa)

Error: RubyGem dependency memory_profiler ~> 0 is not satisfied.

• Error code 1

This port can be removed since it is not used by any port.