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

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https://hg.mozilla.org/integration/gaia-central/rev/c051a00f86ce
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #26542 from goetsu/Bug-1068713---email-box-role-textbox-

Bug 1068713 - email body role textbox r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/4e37609875f5
Author: goetsu <aurelien.levy@free.fr>
Desc: Bug 1068713 - email body role textbox
Bumping manifests a=b2g-bump