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

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https://hg.mozilla.org/integration/gaia-central/rev/c00a4c50506b
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #26294 from julienw/1101532-load-gaia-header-async

Bug 1101532 - load gaia header async

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https://hg.mozilla.org/integration/gaia-central/rev/969dda5f6aac
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1101532 - [Messages] load the gaia header asynchronously r=schung
Bumping manifests a=b2g-bump