chore: bump NUglify from 1.20.7 to 1.21.0 in /src (bdovaz#259)

Bumps [NUglify](https://github.com/trullock/NUglify) from 1.20.7 to 1.21.0.
- [Release notes](https://github.com/trullock/NUglify/releases)
- [Changelog](https://github.com/trullock/NUglify/blob/master/changelog.md)
- [Commits](trullock/NUglify@v1.20.7...v1.21.0)

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

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

Author: dependabot[bot]

src/UnityNuGet/UnityNuGet.csproj

@@ -26,7 +26,7 @@
     <PackageReference Include="Microsoft.Extensions.Options" Version="7.0.1" />
     <PackageReference Include="NuGet.PackageManagement" Version="6.7.0" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="7.0.0" />
-    <PackageReference Include="NUglify" Version="1.20.7" />
+    <PackageReference Include="NUglify" Version="1.21.0" />
     <PackageReference Include="Scriban" Version="5.9.0" />
     <PackageReference Include="SharpZipLib" Version="1.4.2" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />