Bump Verify.NUnit from 30.20.1 to 31.0.0 (#252)

---
updated-dependencies:
- dependency-name: Verify.NUnit
  dependency-version: 31.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -13,6 +13,6 @@
     <PackageVersion Include="ProjectDefaults" Version="1.0.161" />
     <PackageVersion Include="Polyfill" Version="8.9.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
-    <PackageVersion Include="Verify.NUnit" Version="30.20.1" />
+    <PackageVersion Include="Verify.NUnit" Version="31.0.0" />
   </ItemGroup>
 </Project>