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

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https://hg.mozilla.org/integration/gaia-central/rev/290a37a723ba
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16535 from KevinGrandon/bug_974163_disable_rocketbar

Bug 974163 - Turn off rocketbar by default in 1.4 build time r=me

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https://hg.mozilla.org/integration/gaia-central/rev/e40773248ff9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 974163 - Turn off rocketbar by default in 1.4 build time
Bumping manifests a=b2g-bump