Install fails if postgres_version is not set

[d1nuc0m]

Describe the Bug

Automatic setup of PostgreSQL does not work unless an updated version is specified

Expected Behavior

Minimal install works:

class { 'puppetdb':
}

Steps to Reproduce

Steps to reproduce the behavior:

1. Try a minimal install

class { 'puppetdb':
}

PostgreSQL install fails as packages are not in the repositories

2. Specify a supported PostgreSQL version (>= 12)

class { 'puppetdb':
  postgres_version  => '13',
}

and install succeeds

Environment

• Version [7.13.0]
• Platform [EL 9.x]

Additional Context

The most up-to-date puppetlabs-postgresql supported by this module (8.3.0) defaults to postgres 11, as it was supported at release time. Now it is EOL, so packages have been removed from the repositories and install fails