Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/9dedf6203a89
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #10921 from gtorodelvalle/dialer-bug-892412-font-family-removal

Bug 892412 - [Dialer][Call Log] Removing references to specific fonts (r=etiennesegonzac).

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https://hg.mozilla.org/integration/gaia-central/rev/7c5a0726d83a
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 892412 - [Dialer][Call Log] Removing references to specific fonts.