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

========

https://hg.mozilla.org/integration/gaia-central/rev/600645ecdf69
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #24081 from viorelaioia/bug_1053793

Bug 1053793 - Investigate if asserts in everything.me tests are reliable...

========

https://hg.mozilla.org/integration/gaia-central/rev/9dfd1c2f81e0
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1053793 - Investigate if asserts in everything.me tests are reliable/correct
Bumping manifests a=b2g-bump