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

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https://hg.mozilla.org/integration/gaia-central/rev/effe15800cd2
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #19277 from azasypkin/bug-1010301-spinner-style

Bug 1010301 - [B2G][Messaging App] Spinning icon when sending an sms and mms is not displayed. Using different progress styles for incoming and outgoing message bubbles. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/50b8a7f1aa15
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1010301 - [B2G][Messaging App] Spinning icon when sending an sms and mms is not displayed. Using different progress styles for incoming and outgoing message bubbles. r=julien
Bumping manifests a=b2g-bump