deps(dotnet): Bump the testing group with 4 updates (#12)

* deps(dotnet): Bump the testing group with 4 updates

Bumps coverlet.collector from 6.0.2 to 6.0.4
Bumps FluentAssertions from 7.0.0 to 8.8.0
Bumps xunit from 2.9.2 to 2.9.3
Bumps xunit.runner.visualstudio from 2.8.2 to 3.1.5

---
updated-dependencies:
- dependency-name: coverlet.collector
  dependency-version: 6.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: testing
- dependency-name: FluentAssertions
  dependency-version: 8.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: testing
- dependency-name: xunit
  dependency-version: 2.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: testing
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.5
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: testing
...

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

* fix: update FluentAssertions API for v8.x compatibility

BeGreaterOrEqualTo renamed to BeGreaterThanOrEqualTo in FluentAssertions 8.x

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Karl Bauer <karl.bauer@bauer-group.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -60,10 +60,10 @@
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <!-- Testing -->
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageVersion Include="xunit" Version="2.9.2" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
-    <PackageVersion Include="coverlet.collector" Version="6.0.2" />
-    <PackageVersion Include="FluentAssertions" Version="7.0.0" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageVersion Include="coverlet.collector" Version="6.0.4" />
+    <PackageVersion Include="FluentAssertions" Version="8.8.0" />
     <PackageVersion Include="Moq" Version="4.20.72" />
   </ItemGroup>
 </Project>

tests/BAUERGROUP.Shared.Plattform.Test/Core/SimpleSingletonTests.cs

@@ -82,7 +82,7 @@ public void Instance_IsLazilyInitialized()
         var instance = SimpleSingleton<LazyTestClass>.Instance;
 
         instance.Should().NotBeNull();
-        LazyTestClass.InstanceCount.Should().BeGreaterOrEqualTo(1);
+        LazyTestClass.InstanceCount.Should().BeGreaterThanOrEqualTo(1);
     }
 
     public class LazyTestClass