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

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https://hg.mozilla.org/integration/gaia-central/rev/b3feeb526c5f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21825 from empoalp/bug_1038616

Bug 1038616 - [Dialer] Busy tone not playing

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https://hg.mozilla.org/integration/gaia-central/rev/afebfa2cc9c7
Author: David Garcia <davidg@tid.es>
Desc: Bug 1038616 - [Dialer] Busy tone not playing

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https://hg.mozilla.org/integration/gaia-central/rev/a5d974f65664
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Revert "Bug 1017756 - Update Loop buttons & state (color, name, visibility...) in contact details when a branding/UX decision is taken"

This reverts commit 703fbd5d3fbb52633ed808762fe89ce6634d595e.
Bumping manifests a=b2g-bump