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

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https://hg.mozilla.org/integration/gaia-central/rev/f297eacfc645
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #22420 from vingtetun/performance.regression.panning

Bug 1047390 - Performance regression while panning. r=cwiiis

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https://hg.mozilla.org/integration/gaia-central/rev/89436e00a077
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1047390 - Performance regression while panning. r=cwiiis
Bumping manifests a=b2g-bump