Bump Verify.NUnit from 31.9.0 to 31.9.3

---
updated-dependencies:
- dependency-name: Verify.NUnit
  dependency-version: 31.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -13,6 +13,6 @@
     <PackageVersion Include="ProjectDefaults" Version="1.0.170" />
     <PackageVersion Include="Polyfill" Version="9.4.1" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
-    <PackageVersion Include="Verify.NUnit" Version="31.9.0" />
+    <PackageVersion Include="Verify.NUnit" Version="31.9.3" />
   </ItemGroup>
 </Project>