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

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https://hg.mozilla.org/integration/gaia-central/rev/868cb765ed5d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18744 from chirarobert/wait_master

Bug 995187 - Call log is not showing the full phone number

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https://hg.mozilla.org/integration/gaia-central/rev/9488ae914205
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 995187 - [1.4]Call log is not showing the full phone number
Bumping manifests a=b2g-bump