Have SQL connection pool handle racy uncancellable timeout. #1621

Job	Run time
CI-CD / CI (ubuntu-latest, 11, MSSQL-2017-latest) / Run tests	1m 35s
CI-CD / CI (ubuntu-latest, 11, MSSQL-2019-latest) / Run tests	1m 34s
CI-CD / CI (ubuntu-latest, 25, MariaDB-10.4) / Run tests	2m 6s
CI-CD / CI (ubuntu-latest, 11, SQL-templates) / Run tests	7m 47s
CI-CD / CI (ubuntu-latest, 25, MySQL-5.7) / Run tests	2m 10s
CI-CD / CI (ubuntu-latest, 11, PostgreSQL-11) / Run tests	5m 2s
CI-CD / CI (ubuntu-latest, 11, PostgreSQL-9) / Run tests	4m 12s
CI-CD / CI (ubuntu-latest, 11, MySQL-5.6) / Run tests	2m 14s
CI-CD / CI (ubuntu-latest, 11, PostgreSQL-10) / Run tests	4m 35s
CI-CD / CI (ubuntu-latest, 11, MySQL-5.7) / Run tests	2m 3s
CI-CD / CI (ubuntu-latest, 25, MSSQL-2019-latest) / Run tests	1m 40s
CI-CD / CI (ubuntu-latest, 11, DB2-11.5) / Run tests	6m 10s
CI-CD / CI (ubuntu-latest, 25, PostgreSQL-11) / Run tests	4m 28s
CI-CD / CI (ubuntu-latest, 25, Oracle-23) / Run tests	2m 3s
CI-CD / CI (ubuntu-latest, 11, MariaDB-10.4) / Run tests	2m 3s
CI-CD / CI (ubuntu-latest, 11, MySQL-8.0) / Run tests	2m 20s
CI-CD / Deploy to OSSRH / Deploy (Oracle) to OSSRH	38s
CI-CD / Deploy to OSSRH / Deploy to OSSRH	1m 52s
	54m 32s

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