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

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https://hg.mozilla.org/integration/gaia-central/rev/12a30b77070e
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #19583 from shamenchens/Bug1015047-AppList

Bug1015047 - [Build System] Add FTU to app list, r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/e0d6927dd143
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug1015047 - [Build System] Add FTU to app list
Bumping manifests a=b2g-bump