Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/5cf9abd14f7e
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #12296 from gtorodelvalle/contacts-bug-910170-export-button-not-disabled

Bug 910170 - [CONTACTS] The export button isn't disabled when no contact is selected (r=jmcanterafonseca).

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https://hg.mozilla.org/integration/gaia-central/rev/ae1bb0ba69c5
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 910170 - [CONTACTS] The export button isn't disabled when no contact is selected.

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https://hg.mozilla.org/integration/gaia-central/rev/81b0bdb11125
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #12295 from gtorodelvalle/contacts-bug-916100-footer-button-not-disabled

Bug 916100 - [Contacts] Taapping on the disabled merge button when there are not contacts selected to be merged make it to change its colour (r=jmcanterafonseca)

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https://hg.mozilla.org/integration/gaia-central/rev/5ea89914d834
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 916100 - [Contacts] Taapping on the disabled merge button when there are not contacts selected to be merged make it to change its colour.