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

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https://hg.mozilla.org/integration/gaia-1_4/rev/4a595657df9f
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 949741 - Show/hide supplementary services based on connected network type
Bumping manifests a=b2g-bump