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

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https://hg.mozilla.org/integration/gaia-central/rev/38f7f7b70b14
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #14933 from dmarcos/bug952922

Bug 952922 - Change Makefile rule dependencies to generate applications-...

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https://hg.mozilla.org/integration/gaia-central/rev/ca1b7746f505
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 952922 - Change Makefile rule dependencies to generate applications-data before building individual apps