private-networking module's privateDnsZone Hub Spoke has Bicep Core Diagnostics Error BCP420

When pulling the repo down, my code editor immediately flagged the shared `private-netwokring.bicep` module's privateDnsZoneDeployment with an error on the `scope` attribute:

`The scope could not be resolved at compile time because the supplied expression is ambiguous or too complex. Scoping expressions must be reducible to a specific kind of scope without knowledge of parameter values.bicep[BCP420](https://aka.ms/bicep/core-diagnostics#BCP420)`

Start with the shared `private-netwokring.bicep` module and inspect the `privateDnsZoneDeployment` `scope` attribute that triggers BCP420. Reproduce the diagnostic in the editor or Bicep compiler, then verify that the scope error is resolved without introducing new diagnostics.

Written by the indexing model from the issue text.