Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/dfeb3d9b3ca4
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #10157 from evanxd/bug-870756

Bug 870756 - [SMS] No Notification sound when SMS class 0(popup) is recived

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https://hg.mozilla.org/integration/gaia-central/rev/f9bff0502b45
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 870756 - Play ring tone when receive class-0 type message.

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https://hg.mozilla.org/integration/gaia-central/rev/bf673376d353
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #10100 from evanxd/bug-864555

Bug 864555 -  - [Dialer] [Regional] Display the voice mail label when calling to the VM service and the VM is not stored on the SIM

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https://hg.mozilla.org/integration/gaia-central/rev/c2ae5f66912d
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 864555 - Show the voicemail label.