build(deps): bump coverlet.msbuild from 3.1.1 to 3.1.2 (#629)

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](https://github.com/coverlet-coverage/coverlet/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

Author: dependabot[bot]

tests/Directory.Build.props

@@ -22,7 +22,7 @@
 		<PackageReference Include="xunit" Version="2.4.1" />
 		<PackageReference Include="Xunit.Combinatorial" Version="1.4.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" PrivateAssets="All" />
-		<PackageReference Include="coverlet.msbuild" Version="3.1.1" PrivateAssets="All" />
+		<PackageReference Include="coverlet.msbuild" Version="3.1.2" PrivateAssets="All" />
 	</ItemGroup>
 
 	<ItemGroup Condition="('$(TargetFramework)' == 'netstandard2.1' OR '$(TargetFramework)' == 'netcoreapp3.1')">