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

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https://hg.mozilla.org/integration/gaia-central/rev/624e8a418591
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #10510 from daleharvey/813363

Bug 813363 - Ensure loading state is correctly displayed on newly displa... r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/2bf2cfea6b74
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 813363 - Ensure loading state is correctly displayed on newly displayed tabs