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

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https://hg.mozilla.org/integration/gaia-central/rev/077af36fcd81
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #19602 from iFadey/bug-990047

Bug 990047 - Add a shared function to load JSON files r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/660356be13c6
Author: Fawad Hassan <ifadey@ymail.com>
Desc: Bug 990047 - Add a shared function to load JSON files and use it throughout gaia to replace the existing ad-hoc functions
Bumping manifests a=b2g-bump