Fix typo

Author: sylwia-budzynska

python/ql/test/library-tests/frameworks/oracledb/pep249.py

@@ -1,5 +1,5 @@
 import oracledb
 
-connection = oracledb.connect(user=u"username", password="password", dsn="connectstring")
+connection = oracledb.connect(user="username", password="password", dsn="connectstring")
 cursor = connection.cursor()
 cursor.execute("some sql")  # $ getSql="some sql"