Use .NET 6.0 Preview 4.

Author: bgrainger

.github/workflows/publish-package.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Set up .NET 6.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 6.0.100-preview.3.21202.5
+        dotnet-version: 6.0.100-preview.4.21255.9
 
     - name: Restore
       run: dotnet restore

.github/workflows/sonarcloud.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Set up .NET 6.0
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 6.0.100-preview.3.21202.5
+          dotnet-version: 6.0.100-preview.4.21255.9
       - name: Restore Packages
         run: dotnet restore
       - name: Build and analyze

appveyor.yml

@@ -11,7 +11,7 @@ install:
   - ps: Invoke-WebRequest -Uri "https://dot.net/v1/dotnet-install.ps1" -OutFile "install-dotnet.ps1"
   - ps: .\install-dotnet.ps1 -Version 3.1.405 -InstallDir "dotnetcli"
   - ps: .\install-dotnet.ps1 -Version 5.0.102 -InstallDir "dotnetcli"
-  - ps: .\install-dotnet.ps1 -Version 6.0.100-preview.3.21202.5 -InstallDir "dotnetcli"
+  - ps: .\install-dotnet.ps1 -Version 6.0.100-preview.4.21255.9 -InstallDir "dotnetcli"
 build_script:
 - dotnet --info
 before_test:

azure-pipelines.yml

@@ -1,5 +1,5 @@
 variables:
-  DotNetCoreSdkVersion: '6.0.100-preview.3.21202.5'
+  DotNetCoreSdkVersion: '6.0.100-preview.4.21255.9'
   NUGET_PACKAGES: '$(Pipeline.Workspace)/.nuget/packages'
 
 jobs: