Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/f87ea9468bef
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1061532 - Only set the category of a newly apn item to custom when restoring from a custom apn setting

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https://hg.mozilla.org/integration/gaia-2_1/rev/86921158473b
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1058449 - Tapping on the settings button in contacts doesn't have any effect

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https://hg.mozilla.org/integration/gaia-2_1/rev/d4e9a529542e
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1065632 - Reword FxA description in FTE flow. r=sfoster

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https://hg.mozilla.org/integration/gaia-2_1/rev/320eeec54a73
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1064595 - Remove SHB from lockscreen
Bumping manifests a=b2g-bump