Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/63879032b365
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #24158 from pacorampas/1068595

Bug 1068595 - Add data-icon option in lists BB r=arnau

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https://hg.mozilla.org/integration/gaia-central/rev/1ea06b49a0a4
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1068595 - Add data-icon option in lists BB
Bumping manifests a=b2g-bump