Bump coverlet.msbuild from 3.1.1 to 3.1.2

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>

Author: dependabot[bot]

XmlSchemaClassGenerator.Tests/XmlSchemaClassGenerator.Tests.csproj

@@ -19,7 +19,7 @@
     <ProjectReference Include="..\XmlSchemaClassGenerator\XmlSchemaClassGenerator.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="coverlet.msbuild" Version="3.1.1">
+    <PackageReference Include="coverlet.msbuild" Version="3.1.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>