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

========

https://hg.mozilla.org/integration/gaia-central/rev/bdc36dfa4369
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #24813 from pacorampas/1076759

Bug 1076759 - Add data-icon option in buttons BB r=arnau

========

https://hg.mozilla.org/integration/gaia-central/rev/79f51cdc50fa
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1076759 - Add data-icon option in buttons BB
Bumping manifests a=b2g-bump