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

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https://hg.mozilla.org/integration/gaia-central/rev/d38b2bb59bec
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #13231 from gtorodelvalle/contacts-bug-925665-deleting-custom-tag

Bug 925665 - [Contacts] Not possible to delete text in a custom tag by tapping on 'x' icon (r=jmcanterafonseca)

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https://hg.mozilla.org/integration/gaia-central/rev/d1cd551d00ab
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 925665 - [Contacts] Not possible to delete text in a custom tag by tapping on 'x' icon