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

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https://hg.mozilla.org/integration/gaia-central/rev/cd6102d5b215
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25196 from KevinGrandon/bug_1083521_remove_old_ci

Bug 1083521 - Remove old CI scripts

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https://hg.mozilla.org/integration/gaia-central/rev/2d00455d9645
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1083521 - Remove old CI scripts r=gaye
Bumping manifests a=b2g-bump