Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/ea78637449ab
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #17388 from lissyx/bug985117

Bug 985117 - Use the correct SIM number to query voicemail number r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/d9069a668632
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 985117 - Use the correct SIM number to query voicemail number

========

https://hg.mozilla.org/integration/gaia-central/rev/0e62b290a09b
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #17440 from DouglasSherk/985888-active-call-ui

Bug 985888 - [DSDS] Display currently in-use SIM cards on call buttons. r=rik

========

https://hg.mozilla.org/integration/gaia-central/rev/ee490a6a60cb
Author: DouglasSherk <github@sherk.me>
Desc: Bug 985888 - [DSDS] Display currently in-use SIM cards on call buttons. r=rik
Bumping manifests a=b2g-bump