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

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https://hg.mozilla.org/integration/gaia-central/rev/bf8c2276705b
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #26890 from jrburke/bug1087066-email-rtl-checkbox

Bug 1087066 - Checkboxes should not overlap in message list r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/c888457825c7
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1087066 - Checkboxes should not overlap in message list
Bumping manifests a=b2g-bump