Bump xunit.extensibility.core

Bumps [xunit.extensibility.core](https://github.com/xunit/xunit) from 2.5.1 to 2.5.3.
- [Commits](xunit/xunit@2.5.1...2.5.3)

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

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

Author: dependabot[bot]

framework/libraries/migrate-library-csproj-keep-existing/tests/Car.Tests.Net45/Car.Tests.Net45.csproj

@@ -25,7 +25,7 @@
     <PackageReference Include="xunit.analyzers" Version="1.4.0" />
     <PackageReference Include="xunit.assert" Version="2.5.3" />
     <PackageReference Include="xunit.core" Version="2.5.3" />
-    <PackageReference Include="xunit.extensibility.core" Version="2.5.1" />
+    <PackageReference Include="xunit.extensibility.core" Version="2.5.3" />
     <PackageReference Include="xunit.extensibility.execution" Version="2.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
   </ItemGroup>

framework/libraries/migrate-library-csproj-keep-existing/tests/Car.Tests.Net45/packages.config

@@ -5,7 +5,7 @@
   <package id="xunit.analyzers" version="1.4.0" targetFramework="net452" />
   <package id="xunit.assert" version="2.5.3" targetFramework="net452" />
   <package id="xunit.core" version="2.5.3" targetFramework="net452" />
-  <package id="xunit.extensibility.core" version="2.5.1" targetFramework="net452" />
+  <package id="xunit.extensibility.core" version="2.5.3" targetFramework="net452" />
   <package id="xunit.extensibility.execution" version="2.5.3" targetFramework="net452" />
   <package id="xunit.runner.visualstudio" version="2.5.3" targetFramework="net46" />
 </packages>