Bump train-core to 3.5.4
Bump train-core to 3.5.4

This pull request was triggered automatically via Expeditor when train-core 3.5.4 was promoted to Rubygems.

This change falls under the obvious fix policy so no Developer Certificate of Origin (DCO) sign-off is required.

mattray/chef,mwrock/chef,gene1wood/chef,chef/chef,nvwls/chef,MsysTechnologiesllc/chef,tas50/chef-1,gene1wood/chef,mattray/chef,nvwls/chef,MsysTechnologiesllc/chef,nvwls/chef,gene1wood/chef,mattray/chef,nvwls/chef,chef/chef,nvwls/chef,chef/chef,mattray/chef,MsysTechnologiesllc/chef,mwrock/chef,tas50/chef-1,MsysTechnologiesllc/chef,nvwls/chef,mwrock/chef,mattray/chef,tas50/chef-1,gene1wood/chef,mwrock/chef,tas50/chef-1,chef/chef