Bump the ktsu group with 1 update

Bumps ktsu.Extensions from 1.5.8 to 1.5.9

---
updated-dependencies:
- dependency-name: ktsu.Extensions
  dependency-version: 1.5.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ktsu
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.102" />
     <PackageVersion Include="Polyfill" Version="9.3.0" />
     <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.12" />
-    <PackageVersion Include="ktsu.Extensions" Version="1.5.8" />
+    <PackageVersion Include="ktsu.Extensions" Version="1.5.9" />
     <PackageVersion Include="ktsu.CaseConverter" Version="1.3.5" />
   </ItemGroup>
 </Project>