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

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https://hg.mozilla.org/integration/gaia-central/rev/c488c829540f
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #25907 from asutherland/email-coherent-syncfolderlist

Bug 951312 - [email/backend] check_syncFolderList's doneCallback('idempotent') should be doneCallback(null, 'coherent-notyet') so we retry synchronizing the folder list. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/5f441a73479b
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 951312 - [email/backend] check_syncFolderList's doneCallback('idempotent') should be doneCallback(null, 'coherent-notyet') so we retry synchronizing the folder list. r=jrburke

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/350

In bug 951076 we saw a syncFolderList failure from ActiveSync.
ActiveSync triggers an 'aborted-retry' which has us run a check
operation. The check operation intends to have us retry by returning
'idempotent', but screws up and returns it as an error code instead of
the return value.

Also, idempotent is semantically the wrong thing for us to be returning.
'coherent-notyet' is better.
Bumping manifests a=b2g-bump