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

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https://hg.mozilla.org/integration/gaia-central/rev/5fe714c1e8ed
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #23224 from eeejay/bug-1049824

Bug 1049824 - Introduce color filter settings in accessibility panel.

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https://hg.mozilla.org/integration/gaia-central/rev/4132692d356f
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-central/rev/6f472f1c3035
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-central/rev/b4934f20d04c
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1049824 - [Settings] Re-work accessibility panel and introduce color filter settings. r=eragonj
Bumping manifests a=b2g-bump