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

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https://hg.mozilla.org/integration/gaia-central/rev/8f93511b5989
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21335 from pivanov/bug-1020531

Bug 1020531 - All of the strings in the tutorial are left-aligned in RTL locales

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https://hg.mozilla.org/integration/gaia-central/rev/7a3175f7e18e
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1020531 - All of the strings in the tutorial are left-aligned in RTL locales
Bumping manifests a=b2g-bump