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

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https://hg.mozilla.org/integration/gaia-central/rev/e7442299131f
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #13683 from yzen/938007

Bug 938007 - wrapper footer close button now reverts to the original inherited state when homegesture is disabled instead of explcit visible (that confused the screen reader). r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/5cb25752d574
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Bug 938007 - wrapper footer close button reverts to the original inherited state when homegesture is disabled instead of explcit visible (that confuses the screen reader).