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

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https://hg.mozilla.org/integration/gaia-central/rev/9be7377118a2
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #15406 from cctuan/950185

Bug 950185 - [B2G] [Settings] Network type does not show user friendly o...

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https://hg.mozilla.org/integration/gaia-central/rev/4720e2783666
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 950185 - [B2G] [Settings] Network type does not show user friendly options such as 2G and 3G
Bumping manifests a=b2g-bump