DBAL3: Permit installation up to crate-dbal 5.0.0

[amotl]

Note: This patch is stacked upon GH-51, please process that one first.

About

crate-dbal 5.0.0 has been released, adding support for DBAL3.

Status

Software tests appear to be successful.

$ ./vendor/bin/phpunit
PHPUnit 9.6.29 by Sebastian Bergmann and contributors.

................................................................. 65 / 84 ( 77%)
...................                                               84 / 84 (100%)

Time: 00:03.224, Memory: 30.00 MB

OK (84 tests, 171 assertions)

Outlook: Would it be good to have a little CI/GHA configuration to validate the module on each PR against CrateDB nightly? Edit: See GH-52.

References

• Support for Doctrine DBAL 3 crate/crate-dbal#122