Bumping gaia.json for 7 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/138dabc29c93
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1049824 - [Settings] Re-work accessibility panel and introduce color filter settings. r=eragonj

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https://hg.mozilla.org/integration/gaia-2_1/rev/c09e30ec37a9
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1049824 - [System] Mirror accesibility settings to gfx settings when color filter is enabled. r=alive

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https://hg.mozilla.org/integration/gaia-2_1/rev/8a551e22b7bc
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1049824 - Introduce color filters test and update screen reader settings test. f=zac

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https://hg.mozilla.org/integration/gaia-2_1/rev/2d4d7db93368
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1061463 -- Call log must not reuse the string Missed.

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https://hg.mozilla.org/integration/gaia-2_1/rev/115cf14f8dde
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1062007 - "Developer HUD" header is not localized anymore

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https://hg.mozilla.org/integration/gaia-2_1/rev/0e01c563ca13
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1062317 - tutorial-bookmark-migration-tiny string landed with the wrong text

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https://hg.mozilla.org/integration/gaia-2_1/rev/e56782640847
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 995035 - [SMS] Make hidden views hidden from screen reader as well.
Bumping manifests a=b2g-bump