Add osx-arm64 asset to release

[mirkoSekulic]

Description

Releases are missing the netcoredbg-osx-arm64.tar.gz asset.

Adding the osx-arm64 asset to the release would be very convenient, as it allows users to use simple scripts for installation rather than having to compile the code.

[gbalykov]

Please note that osx arm64 is now a community supported architecture, because we're not able to test it at the moment. There're some builds provided by community, and you can also build from source, see #102 and #103 for more details.