test: Fix FluentAssertions in server tests

Author: qdot

Buttplug.Server.Connectors.WebsocketServer.Test/Buttplug.Server.Connectors.WebsocketServer.Test.csproj

@@ -35,8 +35,8 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="FluentAssertions, Version=5.10.3.0, Culture=neutral, PublicKeyToken=33f2691a05b67b6a, processorArchitecture=MSIL">
-      <HintPath>..\packages\FluentAssertions.5.10.3\lib\net47\FluentAssertions.dll</HintPath>
+    <Reference Include="FluentAssertions, Version=5.9.0.0, Culture=neutral, PublicKeyToken=33f2691a05b67b6a, processorArchitecture=MSIL">
+      <HintPath>..\packages\FluentAssertions.5.9.0\lib\net47\FluentAssertions.dll</HintPath>
     </Reference>
     <Reference Include="JetBrains.Annotations, Version=2020.1.0.0, Culture=neutral, PublicKeyToken=1010a0d8d6380325, processorArchitecture=MSIL">
       <HintPath>..\packages\JetBrains.Annotations.2020.1.0\lib\net20\JetBrains.Annotations.dll</HintPath>

Buttplug.Server.Connectors.WebsocketServer.Test/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="FluentAssertions" version="5.10.3" targetFramework="net47" />
+  <package id="FluentAssertions" version="5.9.0" targetFramework="net47" />
   <package id="JetBrains.Annotations" version="2020.1.0" targetFramework="net47" />
   <package id="Namotion.Reflection" version="1.0.12" targetFramework="net47" />
   <package id="Newtonsoft.Json" version="12.0.3" targetFramework="net47" />