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

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https://hg.mozilla.org/integration/gaia-central/rev/38293b5451ab
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22820 from Moz-TedC/bug-1050091-fix

Bug 1050091 - Prevent timezone from being spuriously changed when openin...

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https://hg.mozilla.org/integration/gaia-central/rev/6bee10b187e2
Author: Ted Clancy (:tedders1) <tclancy@mozilla.com>
Desc: Bug 1050091 - Prevent timezone from being spuriously changed when opening Date & Time panel in Settings. r=fcampo
Bumping manifests a=b2g-bump