Fix ExceptionTest::testConnectionExceptionSqLite() on macOS

[morozov]

Q	A
Type	improvement
BC Break	no

The test fails on macOS:

$ phpunit --filter testConnectionExceptionSqLite tests/Doctrine/Tests/DBAL/Functional/ExceptionTest.php
PHPUnit 9.3.2 by Sebastian Bergmann and contributors.

F                                                                                   1 / 1 (100%)

Time: 00:00.023, Memory: 10.00 MB

There was 1 failure:

1) Doctrine\Tests\DBAL\Functional\ExceptionTest::testConnectionExceptionSqLite
Failed asserting that exception of type "Doctrine\DBAL\Exception\ConnectionException" matches expected exception "Doctrine\DBAL\Exception\ReadOnlyException". Message was: "An exception occurred in driver: SQLSTATE[HY000] [14] unable to open database file" at
/Users/smorozov/Projects/dbal/lib/Doctrine/DBAL/Driver/PDO/Exception.php:18
/Users/smorozov/Projects/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:41
/Users/smorozov/Projects/dbal/lib/Doctrine/DBAL/Driver/PDOSqlite/Driver.php:42
/Users/smorozov/Projects/dbal/lib/Doctrine/DBAL/Connection.php:360
/Users/smorozov/Projects/dbal/lib/Doctrine/DBAL/Connection.php:1753
/Users/smorozov/Projects/dbal/lib/Doctrine/DBAL/Connection.php:1390
/Users/smorozov/Projects/dbal/tests/Doctrine/Tests/DBAL/Functional/ExceptionTest.php:342
.

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

According to the currently implemented logic, as non-Linux, macOS falls under the Windows category, therefore, the test changes the DB file mode to 0 which causes the error.