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

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https://hg.mozilla.org/integration/gaia-central/rev/57ec7afa16c0
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #24091 from vishnu16/Bug_8477187_screen_timeout_not_working_on_Stopwatch

Bug 1055488 - [Clock] Screen timeout does not work in Stopwatch. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/bfc91c0cce87
Author: vishnu.dangi <vishnu.dangi@lge.com>
Desc: Bug 1055488 - [Clock] Screen timeout does not work in Stopwatch

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https://hg.mozilla.org/integration/gaia-central/rev/acc3d517a550
Author: gitmai <mri@tid.es>
Desc: Merge pull request #24001 from gitmai/bug-1064507-usage-displays-a-blank-screen

Bug 1064507 - [Cost Control][Usage] Returning to the Usage app displays ...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/2a0deeead512
Author: mai <mri@tid.es>
Desc: Bug 1064507 - [Cost Control][Usage] Returning to the Usage app displays a blank screen on a device set to 319MB memory
Bumping manifests a=b2g-bump