Revert "Merge pull request #2765 from AriaXLi/maint/jruby_ubuntu_integration_failure"

This reverts commit 92a6484, reversing
changes made to bbb2d35.

Previously, sys-filesystem 1.5.2 caused some integration check failures,
but after the release of sys-filesystem 1.5.3, these failures went away.

Author: AriaXLi

facter.gemspec

@@ -42,7 +42,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-performance', '~> 1.5.2'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.10' # last version to support 2.5
   spec.add_development_dependency 'simplecov', '~> 0.17.1'
-  spec.add_development_dependency 'sys-filesystem', ['>= 1.4.0', '<= 1.5.0']
+  spec.add_development_dependency 'sys-filesystem', '~> 1.4'
   spec.add_development_dependency 'webmock', '~> 3.12'
   spec.add_development_dependency 'yard', '~> 0.9'