Bump System.Net.Http in /samples/features/Features.WPF
Bump System.Net.Http in /samples/features/Features.WPF

Bumps System.Net.Http from 4.3.2 to 4.3.4.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
serenabenny/Caliburn.Micro,Caliburn-Micro/Caliburn.Micro