Update dependency SixLabors.ImageSharp to v4

Author: renovate[bot]

src/GenerateMap/GenerateMap.csproj

@@ -3,7 +3,7 @@
 	<Import Project="..\..\template.targets" />
 
 	<ItemGroup>
-	  <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
+	  <PackageReference Include="SixLabors.ImageSharp" Version="4.1.1" />
 	</ItemGroup>
 
     <PropertyGroup>

src/Lagrange.XocMat.Adapter/Lagrange.XocMat.Adapter.csproj

@@ -8,6 +8,6 @@
 
   <ItemGroup>
     <PackageReference Include="protobuf-net" Version="3.2.56" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="4.1.1" />
   </ItemGroup>
 </Project>