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

========

https://hg.mozilla.org/integration/gaia-central/rev/0c87580147f3
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21925 from past/keyboard-bug-1040012

Bug 1040012 - Long press on period key in the Greek keyboard should show...

========

https://hg.mozilla.org/integration/gaia-central/rev/50564046fbc8
Author: Panagiotis Astithas <pastith@gmail.com>
Desc: Bug 1040012 - Long press on period key in the Greek keyboard should show the special character menu. r=rudyl
Bumping manifests a=b2g-bump