Bump coverlet.msbuild from 6.0.4 to 8.0.0 (#867)

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Updated
[coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from
6.0.4 to 8.0.0.

<details>
<summary>Release notes</summary>

_Sourced from [coverlet.msbuild's
releases](https://github.com/coverlet-coverage/coverlet/releases)._

## 8.0.0

**Special Thanks:** A huge thank you to
[@​Bertk](https://github.com/Bertk) for driving the majority of the work
in this release! 🎉

### Fixed
- Fix System.CommandLine 2.0 release is available
[#​1776](coverlet-coverage/coverlet#1776)
- Fix Excluding From Coverage bad defaults from given example
[#​1764](coverlet-coverage/coverlet#1764)
- Fix branchpoint exclusion for sdk 8.0.407
[#​1741](coverlet-coverage/coverlet#1741)
- Fix missing copyright information in NuGet
[#​1794](coverlet-coverage/coverlet#1794)
- Fix bad default values in documentation
[#​1764](coverlet-coverage/coverlet#1764) by
<https://github.com/cboudereau>

### Improvements

- Coverlet MTP extension feature
[#​1788](coverlet-coverage/coverlet#1788)
- Generate SBOM for nuget packages
[#​1752](coverlet-coverage/coverlet#1752)
- Use multi targets projects for coverlet.collector,
coverlet.msbuild.tasks packages
[#​1742](coverlet-coverage/coverlet#1742)
- Use .NET 8.0 target framework for coverlet.core and remove
Newtonsoft.Json
[#​1733](coverlet-coverage/coverlet#1733)
- Use latest System.CommandLine version
[#​1660](coverlet-coverage/coverlet#1660)
- Upgraded minimum required .NET SDK and runtime to .NET 8.0 LTS (Long
Term Support) (**Breaking Change**)
- Use [xunit.v3](https://xunit.net/docs/getting-started/v3/whats-new)
for tests and example code

[Diff between 6.0.4 and
8.0.0](coverlet-coverage/coverlet@v6.0.4...v8.0.0)

Commits viewable in [compare
view](coverlet-coverage/coverlet@v6.0.4...v8.0.0).
</details>

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</details>

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

Directory.Packages.props

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="coverlet.collector" Version="8.0.0" />
-    <PackageVersion Include="coverlet.msbuild" Version="6.0.4" />
+    <PackageVersion Include="coverlet.msbuild" Version="8.0.0" />
     <PackageVersion Include="IntelliTect.Multitool" Version="1.5.3" />
     <PackageVersion Include="IntelliTect.TestTools.Console" Version="1.0.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis" Version="4.14.0" />