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

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https://hg.mozilla.org/integration/gaia-central/rev/d0792f4e925c
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #19887 from benfrancis/1009353

Bug 1009353 - Configure Rocketbar search provider at build time r=kevingrandon r=yuren

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https://hg.mozilla.org/integration/gaia-central/rev/2d2c467f5a50
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1009353 - Configure Rocketbar search provider at build time
Bumping manifests a=b2g-bump