Bump fo-dicom.Imaging.ImageSharp and SixLabors.ImageSharp

Bumps [fo-dicom.Imaging.ImageSharp](https://github.com/fo-dicom/fo-dicom) and [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp). These dependencies needed to be updated together.

Updates `fo-dicom.Imaging.ImageSharp` from 5.1.5 to 5.2.0
- [Release notes](https://github.com/fo-dicom/fo-dicom/releases)
- [Changelog](https://github.com/fo-dicom/fo-dicom/blob/development/ChangeLog.md)
- [Commits](fo-dicom/fo-dicom@5.1.5...5.2.0)

Updates `SixLabors.ImageSharp` from 3.1.6 to 3.1.5
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.1.6...v3.1.5)

---
updated-dependencies:
- dependency-name: fo-dicom.Imaging.ImageSharp
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: SixLabors.ImageSharp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="CommandLineParser" Version="2.9.1" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.4" />
     <PackageVersion Include="CsvHelper" Version="33.0.1" />
-    <PackageVersion Include="fo-dicom.Imaging.ImageSharp" Version="5.1.5" />
+    <PackageVersion Include="fo-dicom.Imaging.ImageSharp" Version="5.2.0" />
     <PackageVersion Include="HIC.DicomTypeTranslation" Version="4.1.5" />
     <PackageVersion Include="HIC.FAnsiSql" Version="3.2.7" />
     <PackageVersion Include="HIC.RDMP.Plugin" Version="8.4.2" />