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

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https://hg.mozilla.org/integration/gaia-central/rev/bf9c093d17fd
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12370 from KevinGrandon/bug_919611_calendar_remove_script_charset

Bug 919611 - Remove unneeded charset attribute r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/bc85706442ef
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 919611 - Remove unneeded charset attribute