Upgrade to Symfony 6.0

[javiereguiluz]

No description provided.

[94noni]

Great PR :)
Also it could be great to add in the readme that the demo uses latest symfony version, and also upgrade the php required version mentionned
:)

[javiereguiluz]

@stof what do you propose to fix the bugs reported by the "Lint / Linters (8.0)" GitHub action?

• Ignore them in this PR, but fix them in a separate PR before the next stable release (the first one compatible with 6.0)
• Ignore them and release the next stable release without fixing them (fix them in the future)
• Fix them in this PR
• Tweak the PHPStan config to remove most of these "bugs"
• other?

Thanks!

[stof]

Most of the errors have 2 sources:

• Symfony 6 provides more precise return types, which means that some baseline errors have disappeared entirely
• the CI now runs phpstan 1, which changed some error message (talking about type rather than typehint) meaning the baseline does not match anymore

In both cases, the fix for this PR is the same: running phpstan analyze --generate-baseline to regenerate the baseline and commit the new phpstan-baseline.neon file.

[stof]

btw, phpstan should be installed through require-dev instead of relying on a global install in github actions, so that the second point (changes due to changing the version of phpstan) only happens when actually updating the phpstan dependency.

[javiereguiluz]

Christophe, I've done what you proposed ... and it worked like a charm 😍 Thanks a lot! I think this PR is now ready.