More Postgres fixes to support AR 7.1 #241

Job	Run time
ARJDBC Tests (SQLite) (jruby-head, sqlite3, test_sqlite3)	42s
Rails Tests (MySQL) (jruby-head, mysql2, rails:test_mysql2, 7-1-stable, false, MySQL)	7m 12s
ARJDBC Tests (MySQL) (jruby-head, mysql2, db:mysql test_mysql2, false, MySQL)	1m 31s
Rails Tests (MySQL) (jruby-head, mysql2, rails:test_mysql2, 7-1-stable, true, MySQL)	7m 23s
ARJDBC Tests (MySQL) (jruby-head, mysql2, db:mysql test_mysql2, true, MySQL)	1m 23s
ARJDBC Tests (Postgres) (jruby-head, postgresql, db:postgresql test_postgresql, false, false)	1m 36s
ARJDBC Tests (Postgres) (jruby-head, postgresql, db:postgresql test_postgresql, false, true)	1m 25s
Rails Tests (Postgres) (jruby-head, postgresql, rails:test_postgresql, 7-1-stable, false)	7m 57s
Rails Tests (SQLite) (jruby-head, sqlite3, rails:test_sqlite3, 7-1-stable)	6m 25s
ARJDBC Tests (Postgres) (jruby-head, postgresql, db:postgresql test_postgresql, true, false)	1m 30s
Rails Tests (Postgres) (jruby-head, postgresql, rails:test_postgresql, 7-1-stable, true)	8m 18s
Rails Tests (SQLite) (jruby-head, sqlite3, rails:test_sqlite3, main)	37s
ARJDBC Tests (Postgres) (jruby-head, postgresql, db:postgresql test_postgresql, true, true)	1m 31s
	47m 30s

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