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

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https://hg.mozilla.org/integration/gaia-central/rev/fdb817bb9058
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #12090 from benfrancis/908927

Bug 908927 - Use templates instead of string concatenation for search URIs

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https://hg.mozilla.org/integration/gaia-central/rev/03070fa85815
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 908927 - Use templates instead of string concatenation for search URIs