on EL8 we go with the current pg implementation

puppet-extensions.spec

@@ -10,7 +10,11 @@
 %define version_gems2 actionmailer --version '~> 4.2.9'
 # we don't need sinatra oder openoffice in jruby
 %define mrionly_gems sinatra roo simpleidn sha3
+%if 0%{?rhel} >= 8
+%define mrionly_gems_version1 pg
+%else
 %define mrionly_gems_version1 pg --version '= 0.20'
+%endif
 # we want the jruby version of pg
 %define jrubyonly_gems jruby-pg sha3-pure-ruby