Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/66b7a85f28d1
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #24725 from gauravmittal1995/correct-costcontrol

Bug 1077149 - Error Fix in CostControl Unit Test. r=gandalf, sr=salva

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https://hg.mozilla.org/integration/gaia-central/rev/20681f36baf0
Author: Gaurav Mittal <gaurav.mittal@students.iiit.ac.in>
Desc: Bug 1077149 - Error Fix in CostControl Unit Test R=gauravmittal1995

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https://hg.mozilla.org/integration/gaia-central/rev/8c7df623579f
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #24676 from mancas/bug1073371

Bug 1073371 - [Voicemail] [Notification] 'SIM x' shown when receiving a .... r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/2e86c9bfec4c
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1073371 - [Voicemail] [Notification] 'SIM x' shown when receiving a vm notification and only 1 sim in device. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/e2ac17f3ac44
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #24673 from sv99/1066988

Bug 1066988 - [clock] unittest picker_test.js for newer chai compatibility (rebased). r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/318fd3aef429
Author: sv99 <sv99@inbox.ru>
Desc: [clock] unittest picker_test.js using assert.include for testing object, not Array or string
Bumping manifests a=b2g-bump