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

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https://hg.mozilla.org/integration/gaia-central/rev/2796d30073cc
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #18498 from zbraniecki/996291-use-mozl10n-once-in-cal

Bug 996291 - mozL10n bootstrap code cleanup in Calendar. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/ba11f59c13bc
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 996291 - mozL10n bootstrap code cleanup in Calendar; r=kgrandon
Bumping manifests a=b2g-bump