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

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https://hg.mozilla.org/integration/gaia-1_2/rev/b8cbe072fc9f
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Revert "Merge pull request #12323 from nullaus/891724-supportcontactcustomization" due to test failures

This reverts commit 534c040499614227c50255a346391e836d1d63d7.