chore: bump the dependencies group

Bumps the dependencies group in /test/FileCurator.Tests with 1 update: [Mecha.xUnit](https://github.com/JaCraig/Mecha).


Updates `Mecha.xUnit` from 2.1.39 to 2.1.40
- [Changelog](https://github.com/JaCraig/Mecha/blob/main/CHANGELOG.md)
- [Commits](JaCraig/Mecha@v2.1.39...v2.1.40)

---
updated-dependencies:
- dependency-name: Mecha.xUnit
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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

test/FileCurator.Tests/FileCurator.Tests.csproj

@@ -110,7 +110,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Mecha.xUnit" Version="2.1.39" />
+    <PackageReference Include="Mecha.xUnit" Version="2.1.40" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
       <PrivateAssets>all</PrivateAssets>