Updated GitHub Actions to support .NET 8 and .NET 9

- Added .NET 8 and 9 to GitHub Actions workflow.
- Fixed build failure due to missing .NET 8 SDK.

Author: ilCosmico

.github/workflows/BUILD_TEST_DSTV_NET.yml

@@ -14,7 +14,11 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: |
+            6.0.x
+            7.0.x
+            8.0.x
+            9.0.x
       - name: Restore dependencies
         run: dotnet restore DSTV.Net.sln
       - name: Build

.github/workflows/PUBLISH_PACKAGES.yml

@@ -17,7 +17,11 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: |
+            6.0.x
+            7.0.x
+            8.0.x
+            9.0.x
       - name: Restore dependencies
         run: dotnet restore
       - name: Test