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

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https://hg.mozilla.org/integration/gaia-central/rev/619fa836a468
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #18941 from jmcanterafonseca/move_redirects2

Bug 1003774 - [FTU-Separation] Move local oauth redirect files

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https://hg.mozilla.org/integration/gaia-central/rev/cedae9b97433
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1003774 - [FTU-Separation] Move local oauth redirect files
Bumping manifests a=b2g-bump