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

========

https://hg.mozilla.org/integration/gaia-central/rev/bee6704dbcc3
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #21332 from evanxd/bug-988516

Bug 988516 - [Calendar] Intermittent failing test, day view events longer than 2h click after first hour

========

https://hg.mozilla.org/integration/gaia-central/rev/578d120dfcba
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 988516 - [Calendar] Intermittent failing test, day view events longer than 2h click after first hour
Bumping manifests a=b2g-bump