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

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https://hg.mozilla.org/integration/gaia-central/rev/9cb1fec488ae
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #10922 from gtorodelvalle/contacts-bug-892410-font-references-removal

Bug 892410 - [Contacts] Removing references to specific fonts (r=arcturus).

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https://hg.mozilla.org/integration/gaia-central/rev/a97a56ac14a2
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 892410 - [Contacts] Removing references to specific fonts.