Update Cortex-Debug to recent version

[mlu]

Is your feature request related to a problem? Please describe.
A clear an request related to a problem? Please describe.**
The version of Cortex-Debug in ide code is 0.3.7 the current version is 0.3.12 from feb 2021, the main difference, apart from some bugfixes is added support for STM32Cube debug server.

Describe the solution you'd like
Update version from 0.3.7 to 0.3.12

[kittaakos]

IDE2 will use cortex-debug@1.5.1. More recent versions require gdb@9+ and the Arduino toolchain has gdb8+. Arduino has to take care of building and redistributing cortex-debug@1.5.1 as it's unavailable from Open VSX.