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

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https://hg.mozilla.org/integration/gaia-central/rev/1b0a42354270
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #19824 from yzen/bug-1018221

Bug 1018221 - making form buttons accessible around the time zone FTU sc...

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https://hg.mozilla.org/integration/gaia-central/rev/2c9c1ab8f0d2
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1018221 - making form buttons accessible around the time zone FTU screen. r=fcampo
Bumping manifests a=b2g-bump