build(deps): bump XunitVersion from 2.6.3 to 2.6.4 in /src (#811)

Bumps `XunitVersion` from 2.6.3 to 2.6.4.

Updates `xunit` from 2.6.3 to 2.6.4
- [Commits](xunit/xunit@2.6.3...2.6.4)

Updates `xunit.runner.console` from 2.6.3 to 2.6.4
- [Commits](xunit/xunit@2.6.3...2.6.4)

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

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

src/DynamicData.Tests/DynamicData.Tests.csproj

@@ -4,7 +4,7 @@
     <NoWarn>$(NoWarn);CS0618;CA1801;CA1812;CA1816;CA1063;CS8767;CS8602;CS8618;IDE1006</NoWarn>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
-    <XunitVersion>2.6.3</XunitVersion>
+    <XunitVersion>2.6.4</XunitVersion>
   </PropertyGroup>
 
   <ItemGroup>