Bump AsepriteDotNet to 1.8.3

Author: AristurtleDev

source/MonoGame.Aseprite.Content.Pipeline/MonoGame.Aseprite.Content.Pipeline.csproj

@@ -27,6 +27,6 @@
 
         <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.1.303" PrivateAssets="All" />
 
-        <PackageReference Include="AsepriteDotNet" Version="1.8.1" />
+        <PackageReference Include="AsepriteDotNet" Version="1.8.3" />
     </ItemGroup>
 </Project>

source/MonoGame.Aseprite/MonoGame.Aseprite.csproj

@@ -25,7 +25,7 @@
 
     <!-- NuGet Package References -->
     <ItemGroup>
-        <PackageReference Include="AsepriteDotNet" Version="1.8.1" />
+        <PackageReference Include="AsepriteDotNet" Version="1.8.3" />
         <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.1.303" PrivateAssets="All" />
     </ItemGroup>