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

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https://hg.mozilla.org/integration/gaia-central/rev/5c0f1a4510c7
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #22058 from eliperelman/bug-1037520-shift-app-launch-start-time-closer-to-user-intent

Bug 1037520 - Shift app launch start time closer to user intent r=hub,alive

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https://hg.mozilla.org/integration/gaia-central/rev/1cf534fbb05a
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1037520 - Shift app launch start time closer to user intent

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https://hg.mozilla.org/integration/gaia-central/rev/15d88b898166
Author: gitmai <mri@tid.es>
Desc: Merge pull request #21579 from mancas/bug1030352

Bug 1030352 - Delete/undo-delete phone number button in edit dialog does...
r=yzen

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https://hg.mozilla.org/integration/gaia-central/rev/fbd77a39be01
Author: Manuel Casas Barrado <mancas.91@gmail.com>
Desc: Bug 1030352 - Delete/undo-delete phone number button in edit dialog does not have an accessibility label
Bumping manifests a=b2g-bump