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

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https://hg.mozilla.org/integration/gaia-central/rev/236989dc1aa4
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #18291 from TheoChevalier/995511-gl-default-layout

Bug 995511 - [l10n][gl] Use Spanish layout keyboard by default for gl
r=rudylu.

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https://hg.mozilla.org/integration/gaia-central/rev/78fa80e487a5
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 995511 - [l10n][gl] Use Spanish layout keyboard by default for gl
Bumping manifests a=b2g-bump