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

========

https://hg.mozilla.org/integration/gaia-central/rev/f47342e0a4e8
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #22484 from ADLR-es/fix-bug-1048186

Bug 1048186 - [Contacts] Fix import timestamps tests to make them asynchronous

========

https://hg.mozilla.org/integration/gaia-central/rev/7fa74a7a0ec1
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 1048186 - [Contacts] Fix import timestamps tests to make them asynchronous
Bumping manifests a=b2g-bump