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

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https://hg.mozilla.org/integration/gaia-central/rev/1da939ece7dc
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #16321 from vingtetun/bug971006-final

Bug 971006 - Remove a sync reflow when showing the utility tray. r=etien...

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https://hg.mozilla.org/integration/gaia-central/rev/225517981dc6
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 971006 - Remove a sync reflow when showing the utility tray. r=etienne
Bumping manifests a=b2g-bump