Bump the tests group with 2 updates

Bumps the tests group with 2 updates: [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit` from 2.4.2 to 2.5.0
- [Commits](xunit/xunit@2.4.2...2.5.0)

Updates `xunit.runner.visualstudio` from 2.4.5 to 2.5.0
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@v2.4.5...2.5.0)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
...

Signed-off-by: dependabot[bot] <[email protected]>

src/RxFree.SourceTests.Legacy/RxFree.SourceTests.Legacy.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\RxFree\build\RxFree.props" />
 
   <PropertyGroup>
@@ -15,8 +15,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
+    <PackageReference Include="xunit" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
   </ItemGroup>
 
   <Import Project="..\RxFree\build\RxFree.targets" />

src/RxFree.SourceTests.Nullable/RxFree.SourceTests.Nullable.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\RxFree\build\RxFree.props" />
 
   <PropertyGroup>
@@ -15,8 +15,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
+    <PackageReference Include="xunit" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
   </ItemGroup>
 
   <Import Project="..\RxFree\build\RxFree.targets" />

src/RxFree.SourceTests/RxFree.SourceTests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\RxFree\build\RxFree.props" />
 
   <PropertyGroup>
@@ -16,8 +16,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
+    <PackageReference Include="xunit" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
   </ItemGroup>
 
   <Import Project="..\RxFree\build\RxFree.targets" />

src/RxFree.Tests/RxFree.Tests.csproj

@@ -1,13 +1,13 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
+    <PackageReference Include="xunit" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
   </ItemGroup>
 
   <ItemGroup>