Bump System.Management.Automation in /src/PasswordProtectionPS

Bumps [System.Management.Automation](https://github.com/PowerShell/PowerShell) from 6.1.5 to 6.1.6.
- [Release notes](https://github.com/PowerShell/PowerShell/releases)
- [Changelog](https://github.com/PowerShell/PowerShell/blob/master/CHANGELOG.md)
- [Commits](PowerShell/PowerShell@v6.1.5...v6.1.6)

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src/PasswordProtectionPS/packages.config

@@ -4,5 +4,5 @@
   <package id="DSInternals.Replication" version="3.2.0" targetFramework="net46" />
   <package id="NDceRpc" version="0.2.1.0" targetFramework="net46" />
   <package id="protobuf-net" version="2.4.0" targetFramework="net46" />
-  <package id="System.Management.Automation" version="6.1.5" targetFramework="net461" />
+  <package id="System.Management.Automation" version="6.1.6" targetFramework="net461" />
 </packages>