Bump xunit from 2.5.1-pre.4 to 2.5.3

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.1-pre.4 to 2.5.3.
- [Commits](https://github.com/xunit/xunit/commits)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/AdoNet.Specification.Tests/AdoNet.Specification.Tests.csproj

@@ -28,7 +28,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="xunit" Version="2.5.1-pre.4" />
+    <PackageReference Include="xunit" Version="2.5.3" />
     <PackageReference Include="xunit.extensibility.execution" Version="2.5.1-pre.4" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />

tests/Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="xunit" Version="2.5.1-pre.4" />
+    <PackageReference Include="xunit" Version="2.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
   </ItemGroup>
 </Project>