Follow-up to #2859772: Update Symfony components to ~2.8.18
Follow-up to #2840596: Update Symfony components to ~2.8.16
Problem/Motivation
while we now have Symfony updated to 2.8.18, other dependencies still need to be updated
Proposed resolution
Update non-Symfony dependencies with patch updates.
Remaining tasks
doit
User interface changes
None
API changes
None
Data model changes
None
