Bumping gaia.json for 2 gaia-central revision(s) a=NPOTB

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https://hg.mozilla.org/integration/gaia-central/rev/73f31b3b0853
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12319 from rnowm/916046

Bug 916046 - Find duplicates button needs an icon

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https://hg.mozilla.org/integration/gaia-central/rev/f336f7c82927
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 916046 - Find duplicates button needs an icon