Updating build workflows

Author: Turnerj

.appveyor.yml

@@ -1,4 +1,4 @@
-image: Visual Studio 2019
+image: Visual Studio 2022
 skip_branch_with_pr: true
 
 environment:
@@ -11,9 +11,6 @@ environment:
 
   BUILD_ARTIFACT_PATH: build-artifacts
 
-install:
-  - choco install dotnet-sdk --version 5.0.200
-
 build_script:
   - ps: dotnet --version
   - ps: dotnet restore

.github/workflows/build.yml

@@ -27,10 +27,13 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
-    - name: Setup dotnet 5.0
-      uses: actions/setup-dotnet@v1
+    - name: Install .NET SDKs
+      uses: actions/setup-dotnet@v1.9.0
       with:
-        dotnet-version: '5.0.x'
+        dotnet-version: |
+          3.1.x
+          5.0.x
+          6.0.x
     - name: Install dependencies
       run: dotnet restore
     - name: Build