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

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https://hg.mozilla.org/integration/gaia-central/rev/959cdae008fd
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #25415 from ADLR-es/vcard-from-mail-test

Bug 1087402 - [contacts] Integration tests for bug #974589 (follow up)

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https://hg.mozilla.org/integration/gaia-central/rev/42f0cd49758d
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 1087402 - [contacts] Integration tests for bug #974589 (follow up)
Bumping manifests a=b2g-bump