Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/5947b380549c
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #18528 from jaoo/998914

Bug 998914 - [Settings] Cannot preselect the APN correctly if there are several APNs with the same carrier name (follow-up bug 991628). r=arthurcc
Bumping manifests a=b2g-bump