Mark exceptions as immutable

baseline.xml

@@ -5,11 +5,6 @@
       <code>int</code>
     </InvalidParamDefault>
   </file>
-  <file src="lib/Doctrine/DBAL/Driver/DriverException.php">
-    <MissingImmutableAnnotation occurrences="1">
-      <code>public function getMessage();</code>
-    </MissingImmutableAnnotation>
-  </file>
   <file src="lib/Doctrine/DBAL/Driver/SQLAnywhere/SQLAnywhereConnection.php">
     <UndefinedFunction occurrences="14">
       <code>sasql_pconnect($dsn)</code>

lib/Doctrine/DBAL/Driver/AbstractDriverException.php

@@ -6,6 +6,8 @@ use Exception;
 
 /**
  * Abstract base implementation of the {@link DriverException} interface.
+ *
+ * @psalm-immutable
  */
 abstract class AbstractDriverException extends Exception implements DriverException
 {

lib/Doctrine/DBAL/Driver/DriverException.php

@@ -9,6 +9,8 @@ use Throwable;
  *
  * Driver exceptions provide the SQLSTATE of the driver
  * and the driver specific error code at the time the error occurred.
+ *
+ * @psalm-immutable
  */
 interface DriverException extends Throwable
 {

lib/Doctrine/DBAL/Driver/Mysqli/MysqliException.php

@@ -6,6 +6,8 @@ use Doctrine\DBAL\Driver\AbstractDriverException;
 
 /**
  * Exception thrown in case the mysqli driver errors.
+ *
+ * @psalm-immutable
  */
 class MysqliException extends AbstractDriverException
 {

lib/Doctrine/DBAL/Driver/OCI8/OCI8Exception.php

@@ -4,6 +4,9 @@ namespace Doctrine\DBAL\Driver\OCI8;
 
 use Doctrine\DBAL\Driver\AbstractDriverException;
 
+/**
+ * @psalm-immutable
+ */
 class OCI8Exception extends AbstractDriverException
 {
     /**

lib/Doctrine/DBAL/Driver/PDOException.php

@@ -4,6 +4,8 @@ namespace Doctrine\DBAL\Driver;
 
 /**
  * Tiny wrapper for PDOException instances to implement the {@link DriverException} interface.
+ *
+ * @psalm-immutable
  */
 class PDOException extends \PDOException implements DriverException
 {

lib/Doctrine/DBAL/Driver/SQLAnywhere/SQLAnywhereException.php

@@ -12,6 +12,8 @@ use function sasql_stmt_error;
 
 /**
  * SAP Sybase SQL Anywhere driver exception.
+ *
+ * @psalm-immutable
  */
 class SQLAnywhereException extends AbstractDriverException
 {

lib/Doctrine/DBAL/Driver/SQLSrv/SQLSrvException.php

@@ -7,6 +7,9 @@ use const SQLSRV_ERR_ERRORS;
 use function rtrim;
 use function sqlsrv_errors;
 
+/**
+ * @psalm-immutable
+ */
 class SQLSrvException extends AbstractDriverException
 {
     /**