Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3f69c9495d4f
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #23223 from zbraniecki/1057529-no-defer-l10njs-in-settings

Bug 1057529 - Move l10n.js in Settings to no-defer. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/581440a2e9d1
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1057529 - Move l10n.js in Settings to no-defer

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https://hg.mozilla.org/integration/gaia-central/rev/ec9c6b12c014
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Revert "Bug 1017328 - [Flatfish] PDF files render incorrectly in the browser app"

This reverts commit 721809bad3fc5fcaf00f7b25cacccfab2ff9c499.
Bumping manifests a=b2g-bump