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

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https://hg.mozilla.org/integration/gaia-central/rev/7ca06f787f88
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #25852 from eeejay/bug-1069484

Bug 1069484 - Make usage checkboxes gaia-checkbox, and unify label. r=salva r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9d60a7f8da0b
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1069484 - Make usage checkboxes gaia-checkbox, and unify label.

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https://hg.mozilla.org/integration/gaia-central/rev/f307c7f4fe3e
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #25550 from eeejay/bug-1069409

Bug 1069409 - Make Usage views exclusively visible to screen reader. r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/42506044c1aa
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1069409 - Make Usage views exclusively visible to screen reader.

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https://hg.mozilla.org/integration/gaia-central/rev/178434180f53
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #25895 from eeejay/bug-1095002

Bug 1095002 - Fix data usage limit dialog accessibility. r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/2fa3415ea2e3
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1095002 - Fix data usage limit dialog accessibility.
Bumping manifests a=b2g-bump