Bump the tests group in /src/SatisfactoryTree.Tests with 1 update

Bumps the tests group in /src/SatisfactoryTree.Tests with 1 update: [MermaidDotNet](https://github.com/samsmithnz/MermaidDotNet).


Updates `MermaidDotNet` from 0.6.6 to 0.6.7
- [Release notes](https://github.com/samsmithnz/MermaidDotNet/releases)
- [Commits](samsmithnz/MermaidDotNet@v0.6.6...v0.6.7)

---
updated-dependencies:
- dependency-name: MermaidDotNet
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: tests
...

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

src/SatisfactoryTree/SatisfactoryTree.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MermaidDotNet" Version="0.6.6" />
+    <PackageReference Include="MermaidDotNet" Version="0.6.7" />
   </ItemGroup>
 
 </Project>