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

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https://hg.mozilla.org/integration/gaia-central/rev/eae44e2db08d
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #11604 from frsela/STK/Bug902768

Bug 902768 - [Buri][STK]No information to user when "alpha ID" is absent or empty within set up call proactive command, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/380fd529cd7a
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: STK: Show default call message if attribute is not provided

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https://hg.mozilla.org/integration/gaia-central/rev/55cfe5607d59
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #11368 from frsela/STK/Bug901864

Bug 901864 - [STK] STK_EVENT_TYPE_IDLE_SCREEN_AVAILABLE support, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/91d1f6e6344a
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Add STK_EVENT_TYPE_IDLE_SCREEN_AVAILABLE support