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

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https://hg.mozilla.org/integration/gaia-central/rev/9af4d6e2fc7f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16756 from TheoChevalier/hud-l10n

Bug 978373 - [l10n][[Settings] Fix l10n for developer-hud

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https://hg.mozilla.org/integration/gaia-central/rev/bf453132d7c5
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 978373 - [l10n][[Settings] Fix l10n for developer-hud
Bumping manifests a=b2g-bump