Upgrade FluentAssertions and VisualStudio XUnit runner

Author: jburnett

.config/dotnet-tools.json

@@ -6,7 +6,15 @@
       "version": "4.0.1",
       "commands": [
         "csmacnz.Coveralls"
-      ]
+      ],
+      "rollForward": false
+    },
+    "dotnet-outdated-tool": {
+      "version": "4.6.7",
+      "commands": [
+        "dotnet-outdated"
+      ],
+      "rollForward": false
     }
   }
 }

common.test.props

@@ -13,8 +13,8 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.*" />
     <PackageReference Include="xunit" Version="2.*" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.*" />
-    <PackageReference Include="FluentAssertions" Version="6.*" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.*" />
+    <PackageReference Include="FluentAssertions" Version="8.*" />
   </ItemGroup>