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

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https://hg.mozilla.org/integration/gaia-central/rev/8df70e11e9f8
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24060 from gauravmittal1995/1057795

Bug #1057795 - Clean up MozL10n API use in Cost Control

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https://hg.mozilla.org/integration/gaia-central/rev/53ed8cc13a15
Author: Gaurav Mittal <gaurav.mittal@students.iiit.ac.in>
Desc: Bug #1057795 - Clean up MozL10n API use in Cost Control R=gauravmittal1995

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https://hg.mozilla.org/integration/gaia-central/rev/606a5494e176
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #24121 from timdream/keyboard-shift-aria-pressed

Bug 1066654 - Set aria-pressed on Shift key, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/c37e96616430
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1066654 - Set aria-pressed on Shift key
Bumping manifests a=b2g-bump