Update workflows to target multiple .NET versions for tests

Added support for .NET 6.0, 8.0, and 9.0 in the release workflow, ensuring compatibility checks across multiple frameworks. Adjusted test steps to run separately for each .NET version. This enhances flexibility and ensures broader runtime support.

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
           dotnet-version: |
             6.0.x
             8.0.x
-            9.0.x # All target .NET SDKs for testing
+            9.0.x
           cache: true
           cache-dependency-path: '**/packages.lock.json'
         env:

.github/workflows/release.yml

@@ -25,7 +25,10 @@ jobs:
       - name: 🛠️ Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 9.0.x
+          dotnet-version: |
+            6.0.x
+            8.0.x
+            9.0.x
           cache: true
           cache-dependency-path: '**/packages.lock.json'
         env:
@@ -38,7 +41,10 @@ jobs:
         run: dotnet build -c Release --no-restore
 
       - name: 🚦 Test
-        run: dotnet test -c Release -l trx --results-directory ./artifacts/ --no-build
+        run: |
+          dotnet test -f net6.0 -c Release -l trx --results-directory ./artifacts/ --no-build
+          dotnet test -f net8.0 -c Release -l trx --results-directory ./artifacts/ --no-build
+          dotnet test -f net9.0 -c Release -l trx --results-directory ./artifacts/ --no-build
 
       - name: 📋 Test reporter
         uses: dorny/test-reporter@v1