Bump NSubstitute from 5.0.0 to 5.1.0

Bumps NSubstitute from 5.0.0 to 5.1.0.

---
updated-dependencies:
- dependency-name: NSubstitute
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/NUnitTestAdapterTests/NUnit.TestAdapter.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <IsTestProject>true</IsTestProject>
@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NSubstitute" Version="5.0.0" />
+    <PackageReference Include="NSubstitute" Version="5.1.0" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="2.10.0" />
     <PackageReference Include="NUnit.Analyzers" Version="3.6.1" />