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

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https://hg.mozilla.org/integration/gaia-central/rev/4c5b3b55ef2c
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25993 from BorisChiou/bug-1091166

Bug 1091166 - Fix the color contrast value when enabling it

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https://hg.mozilla.org/integration/gaia-central/rev/cd5aa723df74
Author: Boris Chiou <boris.chiou@gmail.com>
Desc: Bug 1091166 - Fix the color contrast value when enabling it

The color contrast should also be multiplied by CONTRAST_CAP (0.6)
when enabling the color filter option.

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https://hg.mozilla.org/integration/gaia-central/rev/90615d021789
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25927 from mancas/bug1091910_2

[System]Pressing the "battery is low" notification will sometimes cause ...

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https://hg.mozilla.org/integration/gaia-central/rev/94dbdef48d0a
Author: mancas <manuel.casasbarrado@telefonica.com>
Desc: [System]Pressing the "battery is low" notification will sometimes cause the rocket bar and keyboard to pop up, and will fail to bring up the battery section in the settings menu
Bumping manifests a=b2g-bump