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

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https://hg.mozilla.org/integration/gaia-central/rev/b0d94e9dffae
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1080530 - Ensure triggerFirstRun works offline. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/d2f8b97468de
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #24832 from gmarty/Bug-1074683-Status-bar-signal-strength-update-triggers-reflow-restyles

Bug 1074683 - Status bar signal strength update triggers reflow/restyles

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https://hg.mozilla.org/integration/gaia-central/rev/321bfbd22a93
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1074683 - Status bar signal strength update triggers reflow/restyles
Bumping manifests a=b2g-bump