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

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https://hg.mozilla.org/integration/gaia-central/rev/97fece6c78a6
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #18319 from crh0716/973436_v2

Bug 973436 - Refactor the battery panel using AMD modules r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/e7d97ca56fd1
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 973436 - Refactor the battery panel using AMD modules
Bumping manifests a=b2g-bump