docs: prepares 0.4.0 release notes #131

Job	Run time
Changelog structure	5s
Coverage	57s
Composer audit	15s
PHPStan	27s
Composer validate	10s
CS Fixer	31s
Shellcheck host runner	5s
Tests (PHP 8.5, Symfony 6.4.*)	44s
Tests (PHP 8.4, Symfony 7.4.*)	49s
Tests (PHP 8.5, Symfony 7.4.*)	38s
Tests (PHP 8.4, Symfony 8.1.*)	39s
Tests (PHP 8.4, Symfony 6.4.*)	36s
Tests (PHP 8.3, Symfony 6.4.*)	39s
Tests (PHP 8.5, Symfony 8.1.*)	49s
Tests (PHP 8.2, Symfony 7.4.*)	38s
Tests (PHP 8.2, Symfony 6.4.*, prefer-lowest)	39s
Tests (PHP 8.3, Symfony 7.4.*)	37s
Mutation testing	-9s
	9m 9s

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