Migrate unit and integration tests from Xunit to NUnit and update test dependencies.

Author: napoly

.github/workflows/dotnet.yml

@@ -51,13 +51,13 @@ jobs:
         run: docker compose -f Monero.IntegrationTests/docker-compose.yml down -v
 
       - name: Upload coverage report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-report
           path: coverage/dotcover.xml
 
       - name: Upload NuGet package
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: nuget-package-${{ github.sha }}
           path: nuget-packages/MoneroNet.1.0.0.nupkg

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
           dotnet validate package local nuget-packages/MoneroNet.${{ env.VERSION }}.nupkg
 
       - name: Upload NuGet package
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: nuget-package-${{ github.sha }}
           path: nuget-packages/MoneroNet.${{ env.VERSION }}.nupkg

Monero.IntegrationTests/Monero.IntegrationTests.csproj

@@ -12,8 +12,8 @@
     <ItemGroup>
         <PackageReference Include="coverlet.collector" Version="8.0.1"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0"/>
-        <PackageReference Include="xunit.v3" Version="3.2.2"/>
-        <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5"/>
+        <PackageReference Include="NUnit" Version="4.5.1" />
+        <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
     </ItemGroup>
 
     <ItemGroup>