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

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https://hg.mozilla.org/integration/gaia-central/rev/0c44513e52de
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18461 from KevinGrandon/bug_996662_rocketbar_tests

Bug 996662 - Rocketbar tests are intermittently failing

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https://hg.mozilla.org/integration/gaia-central/rev/d62f60c48ed0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 996662 - Rocketbar tests are intermittently failing r=daleharvey
Bumping manifests a=b2g-bump