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

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https://hg.mozilla.org/integration/gaia-central/rev/5c8cd3f21b4a
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #19687 from arcturus/bug-1016410

Bug 1016410 - [Contacts] Fix unit tests with a newer mocha  r=bkelly r=juliene

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https://hg.mozilla.org/integration/gaia-central/rev/4a82a5eb34cb
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1016410 - [Contacts] Fix unit tests with a newer mocha
Bumping manifests a=b2g-bump