Merge commit from fork

Merge commit from fork

Merge commit from fork

Update the changelog and the language files

Update the changelog and the language files

Update the changelog and the language files

Merge remote-tracking branch 'origin/5.7' into 6.0

# Conflicts:
#	CHANGELOG.md

Version 6.0.3

Fix the backend search permission checks (see #10430)

Description
-----------

Fixes #10429 

After updating to 5.7.14 the backend search does not work anymore and produces the following entries in the log.
This PR fixes the issue.

```
request.CRITICAL: Uncaught PHP Exception TypeError: "Contao\CoreBundle\Security\Voter\DataContainer\TableAccessVoter::supportsAttribute(): Argument #1 ($attribute) must be of type string, array given" at TableAccessVoter.php line 47
```
After fixing that issue the following error message was logged, which is also fixed in this PR.

```
request.CRITICAL: Uncaught PHP Exception Exception: "Serialization of 'Symfony\Component\Security\Core\Authentication\Token\AbstractToken@anonymous' is not allowed" at TableAccessVoter.php line 102
```

Commits
-------

47a5d4d7 Fix backend search permission checks
f5884343 PHPStan
8df1fe0d ECS

Update the changelog and the language files