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

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https://hg.mozilla.org/integration/gaia-central/rev/657c17e410de
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #17520 from sergi/885545-photo-blob

Bug 885545 - Create Blobs for Contact photos in the VCF importer

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https://hg.mozilla.org/integration/gaia-central/rev/e12d68f23fb1
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 885545 - Create Blobs for Contact photos in the VCF importer
Bumping manifests a=b2g-bump