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

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https://hg.mozilla.org/integration/gaia-1_4/rev/1be3c957e14b
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #17373 from crh0716/985090

Bug 985090 - Fix voicemail number migration issue and refactor r=jaoo

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https://hg.mozilla.org/integration/gaia-1_4/rev/ef13a8e2a365
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #17388 from lissyx/bug985117

Bug 985117 - Use the correct SIM number to query voicemail number r=alive
Bumping manifests a=b2g-bump