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

========

https://hg.mozilla.org/integration/gaia-central/rev/2a5d923fff5d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19358 from KevinGrandon/bug_1011118_ftu_gaia_switch_component

Bug 1011118 - [FTU] Implement gaia-switch component

========

https://hg.mozilla.org/integration/gaia-central/rev/b18de006bbbf
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1011118 - [FTU] Implement gaia-switch component r=arcturus
Bumping manifests a=b2g-bump