Bump pinned versions of upstream ICEkit requirements
Bump pinned versions of upstream ICEkit requirements

Update upstream requirements to point to the latest
available commit SHAs on the "develop" branch of:
- icekit-events
- icekit-press-releases

ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit