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

========

https://hg.mozilla.org/integration/gaia-central/rev/cb59e4e8d93b
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #24717 from zbraniecki/1073893-clean-up-mozl10n-api-in-system

1073893 clean up mozl10n api in system. r=kgrandon

========

https://hg.mozilla.org/integration/gaia-central/rev/2d8e005e069d
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1073893: Clean up MozL10n API use in System
Bumping manifests a=b2g-bump