chore: bump the dependencies group

Bumps the dependencies group in /test/Canister.Tests with 2 updates: [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) and [xunit](https://github.com/xunit/xunit).


Updates `xunit.runner.visualstudio` from 2.5.6 to 2.5.7
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.6...2.5.7)

Updates `xunit` from 2.6.6 to 2.7.0
- [Commits](xunit/xunit@2.6.6...2.7.0)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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

test/Canister.Tests/Canister.Tests.csproj

@@ -29,7 +29,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="xunit" Version="2.6.6" />
+    <PackageReference Include="xunit" Version="2.7.0" />
   </ItemGroup>
 
   <ItemGroup>