Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/68a702692c4c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22178 from mikehenrty/bug-1036191-import-headers

Bug 1036191 - include font utils in import page
Bumping manifests a=b2g-bump