Bump .NET Tracer version to 1.22.0 (DataDog#1140)

Update .NET Tracer to 1.21.2-prerelease (DataDog#1104)

Bump the .NET Tracer version to 1.21.1 (DataDog#1099)

Update .NET Tracer version to 1.21.0 (DataDog#1053)

Update .NET Tracer version to 1.20.1-prerelease (DataDog#1032)

Update .NET Tracer version to 1.20.0 (DataDog#1013)

Bump verison to 1.19.6-prerelease (DataDog#986)

Version bump to 1.19.5 (DataDog#968)

version bump 1.19.4 (DataDog#956)

Version bump 1.19.3 (DataDog#934)