appsdk-bump-app-catalog 121 bumping sdk to 900-4843dca

sdk commit: 789676672cce82ebe18a3eb41059cbb4edafc5db
author: Omar Sulehria, Brett Davidson, Andy Gradl and Rick Lansky
message: S56976 - Inline editing of fields in the tree grid

sdk commit: 4843dca94d3793c82f3d6d90693279c47db2cbc0
author: Stefan Kendall
message: S55756 Added browser name and version to feedback info