Bumps submodule reference

Multiple JIRA tickets

Previous HEAD position was 29e9454... Merge pull request #121 from ooici/domain-slicing
HEAD is now at ae69500... Merge pull request #123 from lukecampbell/unlocking

Previous HEAD position was 5b65f99... Merge pull request #406 from lukecampbell/pdefs
HEAD is now at b868a36... Merge pull request #408 from lukecampbell/pdict_update