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

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https://hg.mozilla.org/integration/gaia-central/rev/08d8fe5e18ac
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #24724 from gauravmittal1995/ftu

Bug #1058985 - Clean up MozL10n API use in FTU. r=sfoster, gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/6f37ed8c07c1
Author: Gaurav Mittal <gaurav.mittal@students.iiit.ac.in>
Desc: Bug #1058985 - Clean up MozL10n API use in FTU R=gauravmittal1995
Bumping manifests a=b2g-bump