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

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https://hg.mozilla.org/integration/gaia-central/rev/dcb272ab074b
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #24312 from steveck-chung/bug-836690-follow-up

Bug 836690 - Follow up: Add localization comment for sms segments information string. r=flodolo

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https://hg.mozilla.org/integration/gaia-central/rev/68e57833b4b1
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 836690 - Follow up: Add localization comment for sms segments information string. r=flodolo
Bumping manifests a=b2g-bump