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

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https://hg.mozilla.org/integration/gaia-central/rev/2dbc0be4d39a
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12721 from gtorodelvalle/contacts-bug-904515-national-prefix-matchings

Bug 904515 - [Contact] Matching is not working when phone number is save d with prefix - highlighting part

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https://hg.mozilla.org/integration/gaia-central/rev/452857907187
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 904515 - [Contact] Matching is not working when phone number is saved with prefix - highlighting part.