Bump coverlet.msbuild from 3.0.3 to 3.1.0 (graphql-dotnet#2613)

Author: dependabot[bot]

src/Tests.props

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.msbuild" Version="3.0.3">
+    <PackageReference Include="coverlet.msbuild" Version="3.1.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>