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

========

https://hg.mozilla.org/integration/gaia-central/rev/9d453249697f
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #26334 from Cwiiis/bug1102220-install-in-last-group

Bug 1102220 - Always place apps in the last group when installing. r=kgrandon,crdlc

========

https://hg.mozilla.org/integration/gaia-central/rev/8c47423a409e
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1102220 - Always place apps in the last group when installing. r=kgrandon,crdlc

If the last group is collapsed, instead of placing newly installed apps
into a new group, expand that group and place it there as normal.
Bumping manifests a=b2g-bump