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

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https://hg.mozilla.org/integration/gaia-central/rev/b8bf5ba48dd2
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21503 from nullaus/bug1035367

bug 1035367 - Update download_ui.js so that it uses data-l10n-id and dat...

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https://hg.mozilla.org/integration/gaia-central/rev/f8d74bfa3286
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1035367 - Update download_ui.js so that it uses data-l10n-id and data-l10n-args instead of setting textContent directly. r=crdlc
Bumping manifests a=b2g-bump