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

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https://hg.mozilla.org/integration/gaia-central/rev/3cb56b927c76
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18883 from crdlc/bug-1003787

Bug 1003787 - [Contacts] Different texts to delete contacts: Delete X co...

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https://hg.mozilla.org/integration/gaia-central/rev/a6acb4efcc8a
Author: crdlc <crdlc@tid.es>
Desc: Bug 1003787 - [Contacts] Different texts to delete contacts: Delete X contact?.. in title and text Remove in button
Bumping manifests a=b2g-bump