Fix default password_encryption in postgresql_password based on params

REFERENCE.md

@@ -4429,6 +4429,8 @@ Data type: `Optional[Optional[Postgresql::Pg_password_encryption]]`
 
 Set type for password hash
 
+Default value comes from `postgresql::params::password_encryption` and changes based on the `postgresql::globals::version`.
+
 ##### `salt`
 
 Data type: `Optional[Optional[Variant[String[1], Integer]]]`

lib/puppet/functions/postgresql/postgresql_password.rb

@@ -13,6 +13,8 @@
   #   If the Postgresql-Passwordhash should be of Datatype Sensitive[String]
   # @param hash
   #   Set type for password hash
+  #
+  #   Default value comes from `postgresql::params::password_encryption` and changes based on the `postgresql::globals::version`.
   # @param salt
   #   Use a specific salt value for scram-sha-256, default is username
   #
@@ -27,7 +29,8 @@
     return_type 'Variant[String, Sensitive[String]]'
   end
 
-  def default_impl(username, password, sensitive = false, hash = 'md5', salt = nil)
+  def default_impl(username, password, sensitive = false, hash = nil, salt = nil)
+    hash = call_function(:'postgresql::default', 'password_encryption') if hash.nil?
     password = password.unwrap if password.respond_to?(:unwrap)
     if password.is_a?(String) && password.match?(%r{^(md5[0-9a-f]{32}$|SCRAM-SHA-256\$)})
       return Puppet::Pops::Types::PSensitiveType::Sensitive.new(password) if sensitive

spec/functions/postgresql_password_spec.rb

@@ -3,5 +3,7 @@
 require 'spec_helper'
 
 describe 'postgresql_password' do
+  include_examples 'Ubuntu 18.04'
+
   it_behaves_like 'postgresql_password function'
 end

spec/functions/postgresql_postgresql_password_spec.rb

@@ -3,5 +3,7 @@
 require 'spec_helper'
 
 describe 'postgresql::postgresql_password' do
+  include_examples 'Ubuntu 18.04'
+
   it_behaves_like 'postgresql_password function'
 end