Bump coverlet.msbuild from 3.0.3 to 3.1.0 (#85)

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 3.0.3 to 3.1.0.
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](https://github.com/coverlet-coverage/coverlet/commits/v3.1.0)

---
updated-dependencies:
- dependency-name: coverlet.msbuild
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test/Validation.Tests/Validation.Tests.csproj

@@ -7,7 +7,7 @@
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
-    <PackageReference Include="coverlet.msbuild" Version="3.0.3" />
+    <PackageReference Include="coverlet.msbuild" Version="3.1.0" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\Validation\Validation.csproj" />