Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bcb41edc0aac
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #19396 from millermedeiros/1012508-scroll-perma-fail

Bug 1012507 - Perma failing test, month view #months-day-view scroll r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/e756769b2d01
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1012507 - Perma failing test, month view #months-day-view scroll

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https://hg.mozilla.org/integration/gaia-central/rev/0b7cafc255c0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19411 from KevinGrandon/bug_1013073_sim_picker_naming

Bug 1013073 - Change sim-picker.html to use underscore in filename

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https://hg.mozilla.org/integration/gaia-central/rev/ce7f340c4161
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1013073 - Change sim-picker.html to use underscore in filename r=rik r=drs
Bumping manifests a=b2g-bump