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

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https://hg.mozilla.org/integration/gaia-central/rev/c0f00d1e6bad
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #15957 from millermedeiros/966516-picker-bigger-month

Bug 966516 - [B2G][Calender]Changing the month in an event doesn't update to the number associated with that month r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/213dccdbcd83
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 966516 - [B2G][Calender]Changing the month in an event doesn't update to the number associated with that month
Bumping manifests a=b2g-bump