Bump FluentAssertions from 7.0.0 to 8.7.1

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.7.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -16,7 +16,7 @@
   <!-- Test dependencies -->
   <ItemGroup>
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
-    <PackageVersion Include="FluentAssertions" Version="7.0.0" />
+    <PackageVersion Include="FluentAssertions" Version="8.7.1" />
   </ItemGroup>
   <!-- SourceLink support for all Akka.NET projects -->
   <ItemGroup>

src/Akka.MultiNode.SampleMultiNodeTests/Akka.MultiNode.SampleMultiNodeTests.csproj

@@ -10,6 +10,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <PackageReference Include="FluentAssertions" VersionOverride="8.7.1" />
       <ProjectReference Include="..\Akka.MultiNode.TestAdapter\Akka.MultiNode.TestAdapter.csproj" />
     </ItemGroup>
 

src/Akka.MultiNode.TestAdapter/Akka.MultiNode.TestAdapter.csproj

@@ -30,6 +30,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="FluentAssertions" />
     <Compile Update="Internal\Persistence\VisualizerRuntimeTemplate.cs">
       <DesignTime>True</DesignTime>
       <AutoGen>True</AutoGen>