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

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https://hg.mozilla.org/integration/gaia-central/rev/cea1598e51f1
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #21863 from shamenchens/Bug1033564-FTU-2

Bug1033564 - Enable home gesture when ftu is running, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/0b3fe4809d6e
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug1033564 - Enable home gesture when ftu is running
Bumping manifests a=b2g-bump