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

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https://hg.mozilla.org/integration/gaia-central/rev/6eec007038a2
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18398 from zbraniecki/995960-hide-debug-l10n-keys

Bug 995960 - Hide l10n missing keys during make without LOCALE_BASEDIR s...

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https://hg.mozilla.org/integration/gaia-central/rev/141cedcc1be4
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 995960 - Hide l10n missing keys during make without LOCALE_BASEDIR set. r=stas
Bumping manifests a=b2g-bump