Bump coverlet.msbuild from 2.8.1 to 3.1.0 (#43)

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 2.8.1 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-major
...

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

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

Author: dependabot[bot]

build/Packages.targets

@@ -44,7 +44,7 @@
     <PackageReference Update="EasyTestFile.XUnit" Version="1.0.2" />
 
     <!-- Test coverage -->
-    <PackageReference Update="coverlet.msbuild" Version="2.8.1" />
+    <PackageReference Update="coverlet.msbuild" Version="3.1.0" />
     <PackageReference Update="coverlet.collector" Version="1.2.1" />
 
     <!-- Demo project -->