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

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https://hg.mozilla.org/integration/gaia-central/rev/8d447d740083
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #24196 from zbraniecki/1068929-look-into-shared-for-l10n

Bug 1068929 - We can't skip shared when looking for HTML files to localize. r= stas

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https://hg.mozilla.org/integration/gaia-central/rev/a6b5aa4b16f0
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1068929 - We can't skip shared when looking for HTML files to localize
Bumping manifests a=b2g-bump