Bump Verify.Xunit from 24.1.0 to 26.4.0 in /src

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 24.1.0 to 26.4.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@24.1.0...26.4.0)

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

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

src/CfsAlerts.Tests/CfsAlerts.Tests.csproj

@@ -27,7 +27,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Verify.Xunit" Version="24.1.0" />
+    <PackageReference Include="Verify.Xunit" Version="26.4.0" />
     <PackageReference Include="xunit" Version="2.8.0" />
   </ItemGroup>