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

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https://hg.mozilla.org/integration/gaia-central/rev/34a33f4db7a0
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #22224 from jrburke/bug1028224-email-ui-improvements

Bug 1043529 - email UI: "Load more messages" styling r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/04892febf435
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1028224: email UI: settings chevrons and Load More as a button
Bumping manifests a=b2g-bump