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

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https://hg.mozilla.org/integration/gaia-central/rev/a30074503b9b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16991 from KevinGrandon/bug_980164_systemv2_logo_loader

Bug 980164 - [System2] LogoLoader updates r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/30b24b421a0b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 980164 - [System2] LogoLoader updates r=alive
Bumping manifests a=b2g-bump