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

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https://hg.mozilla.org/integration/gaia-central/rev/51177cf072f9
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #23701 from jpruden92/bug1058312-contacts-v2

Bug 1058312 - [Contacts] Individual Contact Field 'Company' cannot be removed after being updated.

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https://hg.mozilla.org/integration/gaia-central/rev/e24aa7d99680
Author: jprudencio <jpruden92@gmail.com>
Desc: Bug 1058312 - [Contacts] Individual Contact Field 'Company' cannot be removed after being updated.
Bumping manifests a=b2g-bump