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

========

https://hg.mozilla.org/integration/gaia-central/rev/ff1945e9697e
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18668 from crdlc/bug-1001314

Bug 1001314 - Misaligned checkboxes and texts in search mode within mult...

========

https://hg.mozilla.org/integration/gaia-central/rev/75ecf5320844
Author: crdlc <crdlc@tid.es>
Desc: Bug 1001314 - Misaligned checkboxes and texts in search mode within multiple selection
Bumping manifests a=b2g-bump