Bump coverlet.msbuild from 3.1.1 to 6.0.0 in /src

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 3.1.1 to 6.0.0.
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](https://github.com/coverlet-coverage/coverlet/commits/v6.0.0)

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

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

Author: dependabot[bot]

src/GitReleaseManager.Core.Tests/GitReleaseManager.Core.Tests.csproj

@@ -13,7 +13,7 @@
         <ProjectReference Include="..\GitReleaseManager.Core\GitReleaseManager.Core.csproj" />
     </ItemGroup>
     <ItemGroup>
-        <PackageReference Include="coverlet.msbuild" Version="3.1.1">
+        <PackageReference Include="coverlet.msbuild" Version="6.0.0">
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>

src/GitReleaseManager.IntegrationTests/GitReleaseManager.IntegrationTests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <LangVersion>8.0</LangVersion>
         <TargetFrameworks>net472;netcoreapp3.1;net6.0</TargetFrameworks>
@@ -13,7 +13,7 @@
         <ProjectReference Include="..\GitReleaseManager.Core\GitReleaseManager.Core.csproj" />
     </ItemGroup>
     <ItemGroup>
-        <PackageReference Include="coverlet.msbuild" Version="3.1.1">
+        <PackageReference Include="coverlet.msbuild" Version="6.0.0">
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>

src/GitReleaseManager.Tests/GitReleaseManager.Tests.csproj

@@ -13,7 +13,7 @@
         <ProjectReference Include="..\GitReleaseManager.Core\GitReleaseManager.Core.csproj" />
     </ItemGroup>
     <ItemGroup>
-        <PackageReference Include="coverlet.msbuild" Version="3.1.1">
+        <PackageReference Include="coverlet.msbuild" Version="6.0.0">
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>