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

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https://hg.mozilla.org/integration/gaia-central/rev/78299f752da4
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #22077 from guilherme-pg/bug1040300-audience-url

Bug 1040300 - Use the correct audience URL in Find My Device. r=gerard-majax

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https://hg.mozilla.org/integration/gaia-central/rev/aab666abcb68
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 1040300 - Use the correct audience URL in Find My Device.
Bumping manifests a=b2g-bump