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

========

https://hg.mozilla.org/integration/gaia-central/rev/a98d7e35e673
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #23192 from snowmantw/issue1057198-as-iframe

Bug 1057198 - [LockScreen] Decoupling LockScreen with System before it becomes an iframe

========

https://hg.mozilla.org/integration/gaia-central/rev/0e802b40b42b
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1057198 - [LockScreen] Decoupling LockScreen with System before it becomes an iframe
Bumping manifests a=b2g-bump