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

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https://hg.mozilla.org/integration/gaia-central/rev/d63017b5326a
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #23806 from stasm/940772-dehardcode-plural

Bug 940772 - Dehardcode the plural macro. r=gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/e483d7817872
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 940772 - Dehardcode the plural macro. r=gandalf
Bumping manifests a=b2g-bump