Update citoid submodule to master (129ff5)

New changes:

I2406e9 Add unique sessionIDs
I212abc Bug fixes; incorrect indexing
Icaef5a Replaced sync method modifyBody with async
I2d7cf8 Bug fix; no response type set for api/ endpoint
Ia4b58d Adds GET endpoint /api, takes URL & DOI

Change-Id: I9cf5a55654ab92394b8081bccd61b53e9d0e4d11