Update coverlet.msbuild to version 3.0.3

Author: 0xced

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="ApprovalTests" Version="5.4.5" />
     <PackageReference Include="Codecov.MSBuild" Version="1.13.0" />
-    <PackageReference Include="coverlet.msbuild" Version="3.0.2" PrivateAssets="all" />
+    <PackageReference Include="coverlet.msbuild" Version="3.0.3" PrivateAssets="all" />
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" />