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

========

https://hg.mozilla.org/integration/gaia-central/rev/6f0984fb1e4f
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #24987 from jmcanterafonseca/fix_settings_popup2

Bug 1055685 - Contacts settings screen animates in too slowly

========

https://hg.mozilla.org/integration/gaia-central/rev/72432676b962
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1055685 - Contacts settings screen animates in too slowly
Bumping manifests a=b2g-bump