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

========

https://hg.mozilla.org/integration/gaia-central/rev/dcd24331f985
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #20817 from russnicoletti/handleScreenLayoutChange_unit_tests

Support for handleScreenLayoutChange unit testing r=johu

========

https://hg.mozilla.org/integration/gaia-central/rev/2746778cd9fc
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Support for handleScreenLayoutChange unit testing
Bumping manifests a=b2g-bump