Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a5fd868ae557
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #24920 from ADLR-es/vcard-from-mail-prototype

Bug 974589 - [contacts] Contacts needs open activity to support text/vca...

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https://hg.mozilla.org/integration/gaia-central/rev/96b178607d66
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 974589 - [contacts] Contacts needs open activity to support text/vcard because bug 887663 added it to the MimeMapper so email thinks they are downloadable

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https://hg.mozilla.org/integration/gaia-central/rev/b372e70df4eb
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #25274 from albertopq/1063305-add-tests

Bug 1063305 - Add tests to NFC icon r=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/970866e551f6
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1063305 - Add tests to NFC icon
Bumping manifests a=b2g-bump