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

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https://hg.mozilla.org/integration/gaia-central/rev/f7b7e6a219f7
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #25412 from JohanLorenzo/bug-1086676

Bug 1086676 - Add a test to check notification when you miss a call from...

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https://hg.mozilla.org/integration/gaia-central/rev/919e5944928e
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1086676 - Add a test to check notification when you miss a call from a known contact
Bumping manifests a=b2g-bump