Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8119fa676d27
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #16177 from nbp/gaia-ui-test-with-marionette-serial

Bug 970996 - Device serial would be initialized under get_device_manager.

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https://hg.mozilla.org/integration/gaia-central/rev/11cc1e686fa5
Author: Nicolas Pierron <nicolas.b.pierron@gmail.com>
Desc: Bug 970996 - Device serial would be initialized under get_device_manager. r=

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https://hg.mozilla.org/integration/gaia-central/rev/fcac879f0f48
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16202 from flodolo/bug971604

Bug 971604 - Video: make header "month date" localizable in thumbnail mode

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https://hg.mozilla.org/integration/gaia-central/rev/d113cdbd8c71
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 971604 - Video: make header "month date" localizable in thumbnail mode

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https://hg.mozilla.org/integration/gaia-central/rev/29672cd51f5f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16188 from svic/Bug_969136

Bug 969136: Update NFC Manager to handle Tag Discovered, empty tags, and unformatted tags.

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https://hg.mozilla.org/integration/gaia-central/rev/ae8bde1d8732
Author: Garner Lee <garner.lee@telekom.com>
Desc: Bug 969136: Update NFC Manager to handle Tag Discovered, empty tags, and unformatted tags. r=alive
Bumping manifests a=b2g-bump