benchmarks/rubygem-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 derailed_benchmarks.gemspec [1]:

gem.add_dependency "get_process_mem", "~> 0"

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.

Reference: https://github.com/zombocom/derailed_benchmarks/blob/v1.7.0/derailed_benchmarks.gemspec#L27 [1]