Replace usage of `twig_date_converter` with own solution

[alexmerlin]

The issue:

• Function 'twig_date_converter' is deprecated
• Function 'twig_date_converter' is marked as @ internal

Where:
File: src/Extension/DateExtension.php
Lines: 43-44

Recommendation from vendor:
None

Todo:

• Find a solution to achieve the same results with our own function directly in the DateExtension class.
• Remove file psalm-baseline.xml
• Remove line errorBaseline="psalm-baseline.xml" from psalm.xml

[bidi47]

resolved in
#48