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

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https://hg.mozilla.org/integration/gaia-central/rev/c272490580ae
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #27073 from zbraniecki/1109805-deduplicate-l10njs-mutations

Bug 1109805 - Deduplicate mutation targets before calling translate*. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/55eb82f2e280
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Bug 1109805: Deduplicate mutation targets before calling translate*. r=stas
Bumping manifests a=b2g-bump