Symfony version(s) affected: 5.0.9

Description
DoctrineTransport utilizes executeQuery to write a message to the database. executeQuery is meant to be read-only, and when using a MasterSlaveConnection, this can cause the message to be written to a read-only database.

How to reproduce

1. Configure a MasterSlaveConnection with a slave going to a read-only database.
2. Send a message to a DoctrineTransport configured transport.

Possible Solution
Utilize executeUpdate, which is intended for INSERT commands.

Additional context
Courtesy of @christickner in Symfony Devs #support