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

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https://hg.mozilla.org/integration/gaia-central/rev/7ea3d0087762
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #24280 from etiennesegonzac/bug-1070905

Bug 1070905 - (way) Better Cards View performance r=21

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https://hg.mozilla.org/integration/gaia-central/rev/a72ffe92ffcd
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1070905 - (way) Better Cards View performance
Bumping manifests a=b2g-bump