Update to latest cdt-gdb-adapter

[jonahgraham]

This pulls in the latest features, most significantly:

• https://github.com/eclipse-cdt-cloud/cdt-gdb-adapter/pull/268
• https://github.com/eclipse-cdt-cloud/cdt-gdb-adapter/pull/271
• https://github.com/eclipse-cdt-cloud/cdt-gdb-adapter/pull/273

The UART feature pulls in the additions to yarn.lock for the UART dedendencies.