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

========

https://hg.mozilla.org/integration/gaia-central/rev/4d3fccb7b256
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22845 from julienw/1046828-test-for-show-event

Bug 1046828 - proper test for show event

========

https://hg.mozilla.org/integration/gaia-central/rev/26d72bb9c84b
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1046828 - [Notifications API] We should never send the "show" event using system messages at a reboot r=mhenretty

Properly testing the functionality
Bumping manifests a=b2g-bump