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

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https://hg.mozilla.org/integration/gaia-2_0/rev/b6cdfeb1d203
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #22022 from crdlc/bug-1041291

Bug 1041291 - [Vertical Homescreen] Load improvements for configurator.j...(cherry picked from commit e13f1f667a49160c3fa3eab89e189910c46b04dc)
Bumping manifests a=b2g-bump