v1.17.0: Symfony 6 compatibility

Changelog

[9440cbd] minor #155 [CI] Use Flex for testing multiple Symfony versions (@ogizanagi)
[ed782a9] minor #156 Fix 5.4 deprecs & types (@ogizanagi)
[bbc7f2e] feature #157 Allow Symfony 6 (@ogizanagi)
[f2e761a] feature #132 Support default value for generated Doctrine types (@mbrodala)
[a27eece] feature #158 Support for denormalizing XML to an integer Readable enum (@ogizanagi)
[40a1a5a] minor #159 [CI] Limit mongo tests to edges checks (@ogizanagi)

Since v1.17.0-beta.1

[0d11457] minor #160 Fix typo (extra backtick character) in README (@sarim)
[1c944e3] bug #162 Do not trigger a deprecation on FQCN as both keys and values in Doctrine types config (@ogizanagi)
[33cfb10] minor #163 [CI] Prepare for next SF & PHP versions (@ogizanagi)
[89772dd] minor #164 [Docs] Hints about the PHPStan annotations (@ogizanagi)

What's Changed

Full Changelog: v1.16.0...v1.17.0