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

========

https://hg.mozilla.org/integration/gaia-central/rev/0b4b8404a7ee
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #19683 from etiennesegonzac/bug-1011071-wrong-resize

Bug 1011071 - Don't make the LayoutManager lie and special case the lockscreen resize r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/54b516bb0e32
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1011071 - Don't make the LayoutManager lie and special case the lockscreen resize
Bumping manifests a=b2g-bump