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

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https://hg.mozilla.org/integration/gaia-1_4/rev/87f4ad374c1d
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #17288 from arcturus/bug-983777

Bug 983777 - [B2G][Contacts] Tapping the Favorite button on an imported facebook contact will break the Edit Contact button
Bumping manifests a=b2g-bump