Bump the testing group with 4 updates (#8)

Bumps coverlet.collector from 6.0.4 to 10.0.0
Bumps Microsoft.NET.Test.Sdk from 17.8.0 to 18.5.1
Bumps xunit from 2.5.3 to 2.9.3
Bumps xunit.runner.visualstudio from 2.5.3 to 3.1.5

---
updated-dependencies:
- dependency-name: coverlet.collector
  dependency-version: 10.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: testing
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.5.1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: testing
- dependency-name: xunit
  dependency-version: 2.9.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: testing
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.5
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: testing
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: gstraccini[bot] <150967461+gstraccini[bot]@users.noreply.github.com>

Author: dependabot[bot]

tests/Grimoire.Tests/Grimoire.Tests.csproj

@@ -9,15 +9,15 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="6.*">
+    <PackageReference Include="coverlet.collector" Version="10.*">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.*" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.*" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit" Version="2.5.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
 
   <ItemGroup>