chore: bump NUglify from 1.21.2 to 1.21.4 in /src

Bumps [NUglify](https://github.com/trullock/NUglify) from 1.21.2 to 1.21.4.
- [Release notes](https://github.com/trullock/NUglify/releases)
- [Changelog](https://github.com/trullock/NUglify/blob/master/changelog.md)
- [Commits](trullock/NUglify@v1.21.2...v1.21.4)

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

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

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.19.6" />
     <PackageVersion Include="NuGet.PackageManagement" Version="6.8.0" />
     <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" />
-    <PackageVersion Include="NUglify" Version="1.21.2" />
+    <PackageVersion Include="NUglify" Version="1.21.4" />
     <PackageVersion Include="nunit" Version="3.14.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.0.1" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.5.0" />