(#2270) Update to NuGet.exe 5.9.1.11
(#2270) Update to NuGet.exe 5.9.1.11

The previous version of NuGet.exe was no longer able to establish a TLS
connection to NuGet.org, and therefore couldn't resolve packages. This
caused problems on fresh VM's that were attempting to build the
Chocolatey source code.

jberezanski/choco,TheBigBear/choco,jberezanski/choco,jberezanski/choco,TheBigBear/choco,TheBigBear/choco