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

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https://hg.mozilla.org/integration/gaia-central/rev/4b83b2738465
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #17665 from DouglasSherk/987211-clock-lock-call

Bug 987211 - [Dialer][Lockscreen] Fix clock being invisible when receiving a call while screen locked. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/36047b2510e1
Author: DouglasSherk <github@sherk.me>
Desc: Bug 987211 - Make sure l10n_date is loaded before calling back in LazyL10n.get(). r=rik
Bumping manifests a=b2g-bump