Bump the ktsu group with 1 update

Bumps ktsu.Extensions from 1.5.6 to 1.5.7

---
updated-dependencies:
- dependency-name: ktsu.Extensions
  dependency-version: 1.5.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ktsu
...

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

Author: dependabot[bot]

ProjectDirector/ProjectDirector.csproj

@@ -4,7 +4,7 @@
   <ItemGroup>
     <PackageReference Include="DiffPlex" Version="1.8.0" />
     <PackageReference Include="ktsu.AppDataStorage" Version="1.15.6" />
-    <PackageReference Include="ktsu.Extensions" Version="1.5.6" />
+    <PackageReference Include="ktsu.Extensions" Version="1.5.7" />
     <PackageReference Include="ktsu.ImGuiApp" Version="2.1.7" />
     <PackageReference Include="ktsu.ImGuiPopups" Version="1.3.5" />
     <PackageReference Include="ktsu.ImGuiStyler" Version="1.3.12" />