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

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https://hg.mozilla.org/integration/gaia-central/rev/d29b9e448c52
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #25903 from asutherland/modifyaccount-syncrange

Bug 946101 - update syncRange when account updated, tests for it. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/edc342ebc9ed
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 946101 - update syncRange when account updated, tests for it. r=jrburke

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/349
To make sure we update syncRange in the front-end objects so the UI updates
without requiring the user to close the settings UI and reopen it.
Bumping manifests a=b2g-bump