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

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https://hg.mozilla.org/integration/gaia-central/rev/916544475538
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #16080 from jaoo/968092

Bug 968092 - APN Settings: parse apn type 'dun' and 'ims' from apn.json. r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/8d0ed531345f
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Bug 968092 - APN Settings: parse apn type 'dun' and 'ims' from apn.json database
Bumping manifests a=b2g-bump