Bump Verify and Verify.NUnit

Bumps Verify from 31.13.5 to 31.15.0
Bumps Verify.NUnit from 31.13.5 to 31.15.0

---
updated-dependencies:
- dependency-name: Verify
  dependency-version: 31.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Verify.NUnit
  dependency-version: 31.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -11,9 +11,9 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="6.2.0" />
     <PackageVersion Include="Polyfill" Version="9.23.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.172" />
-    <PackageVersion Include="Verify" Version="31.13.5" />
+    <PackageVersion Include="Verify" Version="31.15.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
-    <PackageVersion Include="Verify.Nunit" Version="31.13.5" />
+    <PackageVersion Include="Verify.Nunit" Version="31.15.0" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.5" />
     <PackageVersion Include="Argon" Version="0.33.5" />
     <PackageVersion Include="DiffEngine" Version="19.1.2" />