Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/a31d722fd592
Author: Albert <acperez@tid.es>
Desc: Merge pull request #12571 from acperez/bug-922560

Bug 922560 - Fix typo error. r=yurenju(cherry picked from commit 67243760c86561e365bdd6def519105366e24be3)