Add .NET 6 & .NET6 to GitHub action workflows

Author: Warren Buckley

.github/workflows/codeql-analysis.yml

@@ -43,11 +43,15 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '5.0.x'
+
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: '6.0.x'
-        include-prerelease: true
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/dotnet.yml

@@ -21,11 +21,15 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '5.0.x'
+
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: '6.0.x'
-        include-prerelease: true
 
     - name: Restore dependencies
       run: dotnet restore

.github/workflows/release-nuget.yml

@@ -21,11 +21,15 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '5.0.x'
+
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: '6.0.x'
-        include-prerelease: true
 
     - name: Restore dependencies
       run: dotnet restore