Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b62787992b6a
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #25864 from jrburke/bug1094105-email-hyperlink-target

Bug 1094105 - email not correctly calculating y click when images not loaded in message reader r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/927f212e2466
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1094105 - email not correctly calculating y click when images not loaded in message reader

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https://hg.mozilla.org/integration/gaia-central/rev/726be2921bb3
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #25860 from jrburke/bug1093398-email-double-new-account

Bug 1093398 - [Email] New account page appears again after tapping next r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/e13cb8cedd90
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1093398 - [Email] New account page appears again after tapping next
Bumping manifests a=b2g-bump