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

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https://hg.mozilla.org/integration/gaia-central/rev/7385c208e706
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #13774 from gaye/use-real-npmjs

Bug XXX - Use real npmjs.org since it's up now

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https://hg.mozilla.org/integration/gaia-central/rev/9970a7008c82
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug XXX - Use real npmjs.org since it's up now