devel/rubygem-cms_scanner: 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 puma_worker_killer.gemspec [1]:

gem.add_dependency 'get_process_mem',   '~>  0.2'

Reference: https://github.com/zombocom/puma_worker_killer/blob/v0.3.1/puma_worker_killer.gemspec#L22 [1]