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

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https://hg.mozilla.org/integration/gaia-central/rev/8800f179ae80
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #23444 from Moz-TedC/bug-1052486-fix

Bug 1052486 - Call UIManager.initTZ later, giving the mobile network more time to connect. r=achen

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https://hg.mozilla.org/integration/gaia-central/rev/8a99777d907a
Author: Ted Clancy (:tedders1) <tclancy@mozilla.com>
Desc: Bug 1052486: Call UIManager.initTZ later, giving the mobile network more time to connect. r=achen
Bumping manifests a=b2g-bump