[release/5.1] (deps): Bump Moq from 4.18.2 to 4.20.70

Bumps [Moq](https://github.com/moq/moq) from 4.18.2 to 4.20.70.
- [Release notes](https://github.com/moq/moq/releases)
- [Changelog](https://github.com/devlooped/moq/blob/main/CHANGELOG.md)
- [Commits](moq/moq.spikes@v4.18.2...v4.20.70)

---
updated-dependencies:
- dependency-name: Moq
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

test/Directory.Build.targets

@@ -3,7 +3,7 @@
 
  <PropertyGroup>
   <FluentAssertionsVersion>6.7.0</FluentAssertionsVersion>
-  <MoqVersion>4.18.2</MoqVersion>
+  <MoqVersion>4.20.70</MoqVersion>
   <XunitRunnerVersion>2.4.5</XunitRunnerVersion>
   <TestHostVersion>5.0.17-*</TestHostVersion>
  </PropertyGroup>