Bump xunit.assert from 2.6.6 to 2.9.3

---
updated-dependencies:
- dependency-name: xunit.assert
  dependency-version: 2.9.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Allure.Xunit/Allure.Xunit.csproj

@@ -21,7 +21,7 @@
     <ItemGroup>
         <PackageReference Include="Lib.Harmony" Version="2.4.1" />
         <PackageReference Include="xunit.runner.utility" Version="2.6.6" />
-        <PackageReference Include="xunit.assert" Version="2.6.6" />
+        <PackageReference Include="xunit.assert" Version="2.9.3" />
         <PackageReference Include="xunit.core" Version="2.6.6" />
     </ItemGroup>