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

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https://hg.mozilla.org/integration/gaia-2_0/rev/60900ff5497e
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1070825 - Remove the check of not dialing the same number twice
Bumping manifests a=b2g-bump