docs: prepares 0.4.0 release notes (#35) #133

Job	Run time
Shellcheck host runner	4s
CS Fixer	27s
Composer audit	17s
Changelog structure	6s
PHPStan	24s
Composer validate	12s
Tests (PHP 8.4, Symfony 8.1.*)	40s
Coverage	1m 1s
Tests (PHP 8.3, Symfony 6.4.*)	41s
Tests (PHP 8.4, Symfony 7.4.*)	37s
Tests (PHP 8.5, Symfony 8.1.*)	43s
Tests (PHP 8.4, Symfony 6.4.*)	37s
Tests (PHP 8.5, Symfony 6.4.*)	48s
Tests (PHP 8.2, Symfony 6.4.*, prefer-lowest)	38s
Tests (PHP 8.2, Symfony 7.4.*)	43s
Tests (PHP 8.5, Symfony 7.4.*)	42s
Tests (PHP 8.3, Symfony 7.4.*)	38s
Mutation testing	13m 58s
	23m 16s

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