Bump Moq from 4.18.2 to 4.18.4 (#1992)

Bumps [Moq](https://github.com/moq/moq4) from 4.18.2 to 4.18.4.
- [Release notes](https://github.com/moq/moq4/releases)
- [Changelog](https://github.com/moq/moq4/blob/main/CHANGELOG.md)
- [Commits](devlooped/moq@v4.18.2...v4.18.4)

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

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

Author: dependabot[bot]

test/RestSharp.Tests/RestSharp.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <ItemGroup>
-    <PackageReference Include="Moq" Version="4.18.2" />
+    <PackageReference Include="Moq" Version="4.18.4" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\RestSharp\RestSharp.csproj" />