Update .NET SDK to 7.0 Preview 4.

Author: bgrainger

.ci/integration-tests-steps.yml

@@ -16,6 +16,11 @@ steps:
   inputs:
     version: '5.0.x'
     packageType: runtime
+- task: UseDotNet@2
+  displayName: 'Install .NET Core 6.0'
+  inputs:
+    version: 6.0.x
+    packageType: runtime
 - task: UseDotNet@2
   displayName: 'Install .NET Core'
   inputs:

.ci/mysqlconnector-tests-steps.yml

@@ -1,8 +1,8 @@
 steps:
 - task: UseDotNet@2
-  displayName: 'Install .NET Core 5.0'
+  displayName: 'Install .NET Core'
   inputs:
-    version: '5.0.x'
+    version: 6.0.x
     packageType: runtime
 - task: UseDotNet@2
   displayName: 'Install .NET Core'

appveyor.yml

@@ -1,4 +1,4 @@
-image: Visual Studio 2019
+image: Visual Studio 2022
 services:
 - mysql
 environment:
@@ -9,9 +9,9 @@ cache:
   - '%USERPROFILE%\.nuget\packages -> **\*.csproj'
 install:
   - ps: Invoke-WebRequest -Uri "https://dot.net/v1/dotnet-install.ps1" -OutFile "install-dotnet.ps1"
-  - ps: .\install-dotnet.ps1 -Version 3.1.410 -InstallDir "dotnetcli"
-  - ps: .\install-dotnet.ps1 -Version 5.0.301 -InstallDir "dotnetcli"
-  - ps: .\install-dotnet.ps1 -Version 6.0.100 -InstallDir "dotnetcli"
+  - ps: .\install-dotnet.ps1 -Channel 3.1 -InstallDir "dotnetcli"
+  - ps: .\install-dotnet.ps1 -Channel 5.0 -InstallDir "dotnetcli"
+  - ps: .\install-dotnet.ps1 -Channel 7.0 -Quality preview -InstallDir "dotnetcli"
 build_script:
 - dotnet --info
 before_test:

azure-pipelines.yml

@@ -1,5 +1,5 @@
 variables:
-  DotNetCoreSdkVersion: '6.0.x'
+  DotNetCoreSdkVersion: '7.0.100-preview.4.22252.9'
   NUGET_PACKAGES: '$(Pipeline.Workspace)/.nuget/packages'
 
 jobs:
@@ -44,6 +44,10 @@ jobs:
     displayName: 'Install .NET Core 5.0'
     inputs:
       version: '5.0.x'
+  - task: UseDotNet@2
+    displayName: 'Install .NET Core 6.0'
+    inputs:
+      version: '6.0.x'
   - task: UseDotNet@2
     displayName: 'Install .NET Core'
     inputs:
@@ -107,6 +111,11 @@ jobs:
   pool:
     vmimage: 'windows-latest'
   steps:
+  - task: UseDotNet@2
+    displayName: 'Install .NET Core 6.0'
+    inputs:
+      version: 6.0.x
+      packageType: runtime
   - task: UseDotNet@2
     displayName: 'Install .NET Core'
     inputs:
@@ -183,6 +192,11 @@ jobs:
     inputs:
       version: 3.1.x
       packageType: runtime
+  - task: UseDotNet@2
+    displayName: 'Install .NET Core 6.0'
+    inputs:
+      version: 6.0.x
+      packageType: runtime
   - task: UseDotNet@2
     displayName: 'Install .NET Core'
     inputs: