Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_2/rev/d0b384c29163
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12738 from crdlc/bug-918432-v1.2

Bug 918432 - Operator apps are installed at a fixed position even when the SIM wasn't present at first boot

========

https://hg.mozilla.org/integration/gaia-1_2/rev/2b4611729f94
Author: crdlc <crdlc@tid.es>
Desc: Bug 918432 - Operator apps are installed at a fixed position even when the SIM was not present at first boot