fix(deps): update dependency liip/imagine-bundle to v2.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
liip/imagine-bundle (source)	2.11.0 -> 2.12.0

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Release Notes

liip/LiipImagineBundle (liip/imagine-bundle)

v2.12.0

Compare Source

• Fix documentation filter command parameter name (rdavaillaud)
• Add return types in form (garak) (fixes support of new Symfony versions)
• Improved documentation for flysystem adapter (gregberger)
• Drop support for PHP 7.1, minimum version is now 7.2.
• PHPStan and CS fixes

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