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

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https://hg.mozilla.org/integration/gaia-central/rev/993067c495a5
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #19139 from crdlc/bug-1008033

Bug 1008033 - [Flame] [e.me Homescreen] Can't show more than 12 elements

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https://hg.mozilla.org/integration/gaia-central/rev/e0c259101913
Author: crdlc <crdlc@tid.es>
Desc: Bug 1008033 - [Flame] [e.me Homescreen] Cannot show more than 12 elements
Bumping manifests a=b2g-bump