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

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https://hg.mozilla.org/integration/gaia-central/rev/1b1fd31dac08
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16765 from flodolo/dialer_ampm_l12y

Bug 977145 - [dialer] Make AM/PM localizable when displaying clock

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https://hg.mozilla.org/integration/gaia-central/rev/f04ebf9fe7df
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 977145 - [dialer] Make AM/PM localizable when displaying clock
Bumping manifests a=b2g-bump