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

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https://hg.mozilla.org/integration/gaia-central/rev/88106831512f
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14846 from AndreiH/bug949467

Bug 949467 - Fix intermittent fail in test_homescreen_delete_app

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https://hg.mozilla.org/integration/gaia-central/rev/054646e91744
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 949467 - Fix intermittent fail in test_homescreen_delete_app