version dependency coflicts

Last update to this module via !5 (merged) added a hard dependency on hashicorp/random to >= 3.4.3, < 4.0. This is incompatible with the last version of Google's sql-db terraform module which has a requirement of ~> 3.1. See https://github.com/terraform-google-modules/terraform-google-sql-db/blob/master/modules/postgresql/versions.tf

This causes the following error when using both modules at the same time:

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│ Error: Failed to query available provider packages
│ 
│ Could not retrieve the list of available versions for provider hashicorp/random: no available releases match the given constraints ~> 3.1.0, >= 3.4.3, < 4.0.0
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