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

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https://hg.mozilla.org/integration/gaia-central/rev/e29ffa8b1f3a
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #14840 from gtorodelvalle/contacts-bug-946260-broken-links-when-scrolling

Bug 946260 - [Contacts] Broken link image shown for contacts when scrolling instead of their photo

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https://hg.mozilla.org/integration/gaia-central/rev/5030d022841e
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 946260 - [Contacts] Broken link image shown for contacts when scrolling instead of their photo