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

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https://hg.mozilla.org/integration/gaia-central/rev/450de8ff9ca5
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #17242 from steveck-chung/bug-983858

Bug 983858 - [B2G][SMS]User is given a 'Switch data connection' message when attempting to send a MMS. r=arcturus.

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https://hg.mozilla.org/integration/gaia-central/rev/95cd16ffcc46
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 983858 - [B2G][SMS]User is given a 'Switch data connection' message when attempting to send a MMS
Bumping manifests a=b2g-bump