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

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https://hg.mozilla.org/integration/gaia-central/rev/187b5adc5c43
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #19321 from stasm/pseudolocales

Bug 900182 - Pseudolocalizations for developer builds. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/c1dd1c1e8069
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 900182 - Pseudolocalizations for developer builds. r=yurenju
Bumping manifests a=b2g-bump