build(deps): update Splat.Drawing requirement from 12.* to 13.* in /s…

…rc (#703)

Updates the requirements on [Splat.Drawing](https://github.com/reactiveui/splat) to permit the latest version.
- [Release notes](https://github.com/reactiveui/splat/releases)
- [Commits](reactiveui/splat@12.1.1...13.1.1)

---
updated-dependencies:
- dependency-name: Splat.Drawing
  dependency-type: direct:production
...

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src/Akavache.Drawing/Akavache.Drawing.csproj

@@ -12,6 +12,6 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Akavache.Core\Akavache.Core.csproj" />
-    <PackageReference Include="Splat.Drawing" Version="12.*" />
+    <PackageReference Include="Splat.Drawing" Version="13.*" />
   </ItemGroup>
 </Project>