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

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https://hg.mozilla.org/integration/gaia-2_1/rev/8285bbeb796d
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23696 from mikehenrty/bug-1061924-call-forwarding-flashing

Bug 1061924 - Hide callforwarding and signal icons by default
Bumping manifests a=b2g-bump