Error installing module: mimic_implicit_commit is already in use

Problem/Motivation

On FarmOS installations with PostgreSQL the farm_multitenant_install hook fails to create groups for existing organizations and displays the error:
Drupal\Core\Database\TransactionNameNonUniqueException: A transaction named mimic_implicit_commit is already in use

The problem is caused by a bug in the Drupal pgsql driver, which does not check for duplicate savepoint names. Issue 🐛 Postgres driver issue with nested savepoints mimic_implicit_commit duplicated Needs work describes the problem and its solution.

Proposed resolution

Install the latest patch at 🐛 Postgres driver issue with nested savepoints mimic_implicit_commit duplicated Needs work until such time as the fix in committed to core.