Bump the tunit group with 1 update

Bumps Verify.TUnit from 31.19.1 to 31.20.0

---
updated-dependencies:
- dependency-name: Verify.TUnit
  dependency-version: 31.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tunit
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -17,6 +17,6 @@
     <PackageVersion Include="TUnit" Version="1.56.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
-    <PackageVersion Include="Verify.TUnit" Version="31.19.1" />
+    <PackageVersion Include="Verify.TUnit" Version="31.20.0" />
   </ItemGroup>
 </Project>