phpstan fixes #10

Job	Run time
PHPUnit with PHP version matrix (8.1, 16, pdo_pgsql, lowest)	1m 45s
PHPUnit with PHP version matrix (8.1, 16, pdo_pgsql, highest)	2m 11s
PHPUnit with PHP version matrix (8.2, 16, pdo_pgsql, lowest)	2m 12s
PHPUnit with PHP version matrix (8.2, 16, pdo_pgsql, highest)	2m 17s
PHPUnit with PHP version matrix (8.3, 16, pdo_pgsql, lowest)	2m 49s
PHPUnit with PHP version matrix (8.3, 16, pdo_pgsql, highest)	2m 30s
PHPUnit with SQL Server (8.1, pdo_sqlsrv, mssql)	2m 35s
PHPUnit with PostgreSQL (8.1, 10, pgsql)	2m 30s
PHPUnit with MariaDB (8.1, 10.11, mysqli)	1m 42s
PHPUnit with PostgreSQL (8.1, 10, pdo_pgsql)	2m 18s
PHPUnit with SQLite (ubuntu-22.04, 8.1, pdo_sqlite)	1m 13s
PHPUnit with MariaDB (8.1, 10.11, pdo_mysql)	2m 4s
PHPUnit with MySQL (8.1, 8.0, mysqli)	2m 9s
PHPUnit with SQLite (ubuntu-22.04, 8.1, sqlite3)	1m 13s
PHPUnit with PostgreSQL (8.1, 15, pgsql)	2m 16s
PHPUnit with MariaDB (8.1, 11.0, mysqli)	2m 24s
PHPUnit with MySQL (8.1, 8.0, pdo_mysql)	2m 9s
PHPUnit with MariaDB (8.1, 11.0, pdo_mysql)	1m 57s
PHPUnit with PostgreSQL (8.1, 15, pdo_pgsql)	2m 28s
PHPUnit with MySQL (8.1, 8.2, mysqli)	2m 18s
PHPUnit with MariaDB (8.1, 11.1, mysqli)	1m 43s
PHPUnit with PostgreSQL (8.1, 16, pgsql)	2m 14s
PHPUnit with MariaDB (8.1, 11.1, pdo_mysql)	2m 34s
PHPUnit with MySQL (8.1, 8.2, pdo_mysql)	2m 12s
PHPUnit with PostgreSQL (8.1, 16, pdo_pgsql)	1m 48s
	53m 31s

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