chore(deps): update dependency fluentassertions to 8.6.0

Author: renovate[bot]

DisCatSharp.Tests/SafetyTests/DisCatSharp.SafetyTests.csproj

@@ -4,7 +4,7 @@
 	<Import Project="../../DisCatSharp.Targets/InternalsVisibleTo.targets" />
 
 	<ItemGroup>
-		<PackageReference Include="FluentAssertions" Version="8.5.0" />
+		<PackageReference Include="FluentAssertions" Version="8.6.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
 		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
 		<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.14.0" />