Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/b0d305251334
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #11795 from daleharvey/910011

Bug 910011 - Fix errors while building default application data for browser r=yurenju]

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https://hg.mozilla.org/integration/gaia-central/rev/639421f0dc5e
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 910011 - Fix errors while building default application data for browser