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

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https://hg.mozilla.org/integration/gaia-central/rev/967feac6ca44
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #25457 from ADLR-es/confirm-if-no-contacts

Bug 1072180 - [GAIA][Contacts]if No Contacts on Gmail, while import sele...

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https://hg.mozilla.org/integration/gaia-central/rev/7fd12efcb43a
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 1072180 - [GAIA][Contacts]if No Contacts on Gmail, while import select all and deselect all are enabled
Bumping manifests a=b2g-bump