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

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https://hg.mozilla.org/integration/gaia-central/rev/bdc73f56907e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25473 from KevinGrandon/bug_1088408_calendar_settings_tray_account_error

Bug 1088408 - [Calendar] Allow opening settings tray when account is in error state

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https://hg.mozilla.org/integration/gaia-central/rev/e6dee6435a59
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1088408 - [Calendar] Allow opening settings tray when account is in error state r=millermedeiros
Bumping manifests a=b2g-bump