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

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https://hg.mozilla.org/integration/gaia-1_2/rev/63c901968894
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #13599 from mpizza/Bug_931229_v1.2

Bug 931229 - With kb set to Greek, move to email field, layout remains G...
 (cherry picked from commit 7c1d94133d758af4a7b7534af435dcdcf131ab19)

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https://hg.mozilla.org/integration/gaia-1_2/rev/bbea12f11bda
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 931229 - With kb set to Greek, move to email field, layout remains Greek and can't switch