appsdk-bump-app-catalog 671 bumping sdk to 2293-42844b5

sdk commit: RallySoftware/appsdk@39ab3a488e1e60d593e42dfc2f0bdacbcdd694e6
author: Erika Brice and Ashly Simmons
message: DE20680: On Iteration Tracking App adding a child to a story schedules it to the most recent iteration instead of inheriting from the parent

sdk commit: RallySoftware/appsdk@42844b5050f40379b16520e66c08f0d98ec182cb
author: Dave Thompson and Andrew Ralston
message: S63798: right read only meta fields for defect and task EDP.