Bump Argu from 6.1.0 to 6.1.4

Bumps [Argu](https://github.com/fsprojects/Argu) from 6.1.0 to 6.1.4.
- [Release notes](https://github.com/fsprojects/Argu/releases)
- [Changelog](https://github.com/fsprojects/Argu/blob/master/RELEASE_NOTES.md)
- [Commits](fsprojects/Argu@6.1.0...6.1.4)

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

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

VaughanCli/VaughanCli.fsproj

@@ -33,6 +33,6 @@
     <Compile Include="Program.fs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Argu" Version="6.1.0" />
+    <PackageReference Include="Argu" Version="6.1.4" />
   </ItemGroup>
 </Project>