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

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https://hg.mozilla.org/integration/gaia-central/rev/eb8408898961
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19476 from pacorampas/replace-icons-1009464

Bug 1009464 - Replace outdated icons and add missing ones in Contacts.r=Jordano

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https://hg.mozilla.org/integration/gaia-central/rev/25efc3e63caa
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1009464 - Replace outdated icons and add missing ones in Contacts.

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https://hg.mozilla.org/integration/gaia-central/rev/fd17172ad243
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 995128 - Restore a CSS rule that was lost in the squashing
Bumping manifests a=b2g-bump