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

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https://hg.mozilla.org/integration/gaia-central/rev/55974fe6ab78
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #17047 from qdot/981943-clock-database-fix

Bug 981943 - Add database close to upgrade error in clock database. Fix ...

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https://hg.mozilla.org/integration/gaia-central/rev/0e340f5280ab
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 981943 - Add database close to upgrade error in clock database. Fix event name typo.
Bumping manifests a=b2g-bump