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

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https://hg.mozilla.org/integration/gaia-central/rev/59724218d377
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #23960 from eliperelman/bug-1064595

Bug 1064595 - Remove SHB from lockscreen. r=Etienne

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https://hg.mozilla.org/integration/gaia-central/rev/c0c340d2ce99
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1064595 - Remove SHB from lockscreen
Bumping manifests a=b2g-bump