Bumping gaia.json for 2 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/a13efb9bc24e
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #11720 from rexboy7/fix-bug906981

Bug 906981 - [Lockscreen] Check if mozTelephony exists for desktop build

========

https://hg.mozilla.org/integration/gaia-central/rev/d2401cdc12fa
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 906981 - [Lockscreen] Check if mozTelephony exists for desktop build