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

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https://hg.mozilla.org/integration/gaia-2_1/rev/41e5ae078ca1
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1071983 - fixing regression with hidden status bar icons when switching to previous app. r=etienne

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https://hg.mozilla.org/integration/gaia-2_1/rev/2e439d078f98
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1071382 - [Settings] 2 Icons of brightness level out of place.r=arthurcc

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https://hg.mozilla.org/integration/gaia-2_1/rev/09d1665dd967
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1073032 - Clear ambient indicator when removing notification

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https://hg.mozilla.org/integration/gaia-2_1/rev/5db95090fbee
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1069412 - Email constantly asks me to reauthenticate
Bumping manifests a=b2g-bump