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

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https://hg.mozilla.org/integration/gaia-central/rev/8facea080537
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #15982 from gtorodelvalle/contacts-bug-966622-importing-from-vcf-file

Bug 966622 - [contacts] import hangs at N-1 of N contacts imported from vcf file on memory card/sd card

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https://hg.mozilla.org/integration/gaia-central/rev/12af5d0cf6f2
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 966622 - [contacts] import hangs at N-1 of N contacts imported from.vcf file on memory card/sd card
Bumping manifests a=b2g-bump