Bump xunit.extensibility.execution from 2.5.0 to 2.5.1 in /src (#999)

Bumps [xunit.extensibility.execution](https://github.com/xunit/xunit) from 2.5.0 to 2.5.1.
- [Commits](xunit/xunit@2.5.0...2.5.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Verify.Xunit/Verify.Xunit.csproj

@@ -7,7 +7,7 @@
     <PackageReference Include="ConfigureAwait.Fody" Version="3.3.2" PrivateAssets="All" />
     <PackageReference Include="Fody" Version="6.8.0" PrivateAssets="All" />
     <PackageReference Include="xunit.abstractions" Version="2.0.3" />
-    <PackageReference Include="xunit.extensibility.execution" Version="2.5.0" />
+    <PackageReference Include="xunit.extensibility.execution" Version="2.5.1" />
     <PackageReference Include="ProjectDefaults" Version="1.0.97" PrivateAssets="all" />
     <PackageReference Include="EmptyFiles" Version="4.5.0" PrivateAssets="None" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" Condition="$(Configuration) == 'Release'" />