Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/64229c120bd9
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13744 from fabi1cazenave/uplift-bug916059

Bug 916059 (fix the PIN2 workflow) uplift to v1.2/koi

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https://hg.mozilla.org/integration/gaia-1_2/rev/8261fde4420b
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Bug 916059: (PIN2 workflow) uplift to v1.2/koi