Appveyor: Bump SDK version to 2.2.40*

appveyor.yml

@@ -6,7 +6,7 @@ init:
   - git config --global core.autocrlf input
 
 install:
-- cmd: choco install dotnetcore-sdk --version 2.2.301
+- cmd: choco install dotnetcore-sdk --version 2.2.401
 - cmd: >-
     cd tests\RedisConfigs\3.0.503
 
@@ -69,10 +69,6 @@ nuget:
   disable_publish_on_pr: true
 
 build_script:
-- ps: >-
-    if ($env:OS -eq "Windows_NT") {
-      .\build\dotnet-install.ps1 -Version 2.1.500
-    }
 - ps: .\build.ps1 -PullRequestNumber "$env:APPVEYOR_PULL_REQUEST_NUMBER" -CreatePackages ($env:OS -eq "Windows_NT")
 
 test: off

global.json

 
 {
   "sdk": {
-    "version": "2.2.300"
+    "version": "2.2.400"
   }
 }
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