Update dependencies

Bump Microsoft.NET.Test.Sdk from 18.0.1 to 18.3.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

SimpleGPIO.Tests/SimpleGPIO.Tests.csproj

@@ -6,7 +6,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
 		<PackageReference Include="NSubstitute" Version="5.3.0" />
 		<PackageReference Include="xunit" Version="2.9.3" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />