Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/74a4c9c58bbb
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #12897 from julienw/927470-executable-git-hook

Bug 927470 - Force the executable bit for the git pre-commit hook r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/092d4f56aedc
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 927470 - Force the executable bit for the git pre-commit hook r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/1bd926678e9a
Author: Ben Kelly <ben@wanderview.com>
Desc: Revert "Merge pull request #12322 from davidflanagan/autocorrect-config"

This reverts commit 38456b0b9ee903e597d2a2fd949c10fd673e1993, reversing
changes made to 6b0a8108eac92ab3b5e73946c57f750fe8744356.
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4b4766c317a5
Author: Francisco Borja Salguero Castellano <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #12497 from borjasalguero/customization_ringtone

Bug 891730 - [User Story] Ringtone Runtime Customization by SIM r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/01c8594625ec
Author: borjasalguero <fbsc@tid.es>
Desc: Bug 891730 - [User Story] Ringtone Runtime Customization by SIM r=salva