Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/472fbb8d0adf
Author: Sean Lee <selee@mozilla.com>
Desc: Bug 1127730 - Add icc_events_test.js
In this unit test, we focus how each STK setup events work and their
correctness. Here is the list of the events should be tested:
  STK_EVENT_TYPE_MT_CALL
  STK_EVENT_TYPE_CALL_CONNECTED
  STK_EVENT_TYPE_CALL_DISCONNECTED
  STK_EVENT_TYPE_LOCATION_STATUS - STK_SERVICE_STATE_NORMAL
  STK_EVENT_TYPE_LOCATION_STATUS - STK_SERVICE_STATE_LIMITED
  STK_EVENT_TYPE_USER_ACTIVITY
  STK_EVENT_TYPE_IDLE_SCREEN_AVAILABLE
  STK_EVENT_TYPE_LANGUAGE_SELECTION
  STK_EVENT_TYPE_BROWSER_TERMINATION

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https://hg.mozilla.org/integration/gaia-2_1/rev/96dff5d6f76b
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #28277 from jimporter/bug-1113881

Bug 1113881 - [music] Harden the logic for seeking and play/pause

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https://hg.mozilla.org/integration/gaia-2_1/rev/08808514db63
Author: Jim <jporter@mozilla.com>
Desc: Bug 1113881 - [music] Harden the logic for seeking and play/pause