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

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https://hg.mozilla.org/integration/gaia-central/rev/93cc71e77082
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #19608 from jrburke/bug1013783-shared-styles-2x

Bug 1013783 - Shared styles missing 2x icons r=arnau

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https://hg.mozilla.org/integration/gaia-central/rev/1e95b90a1581
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1013783 - Shared styles missing 2x icons
Bumping manifests a=b2g-bump