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

========

https://hg.mozilla.org/integration/gaia-central/rev/c24176cfc9d1
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23696 from mikehenrty/bug-1061924-call-forwarding-flashing

Bug 1061924 - Hide callforwarding and signal icons by default

========

https://hg.mozilla.org/integration/gaia-central/rev/a2629d53e82a
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1061924 - Hide callforwarding and signal icons by default
Bumping manifests a=b2g-bump