Remove SimpleSAMLphp as a direct dependency #538

Job	Run time
PHP-Linter (8.4) / linter	14s
Linter / json-linter	29s
PHP-Linter (8.5) / linter	16s
Linter / yaml-linter	7s
PHP-Linter (8.3) / linter	13s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.5, windows-latest	1m 12s
Unit tests, PHP 8.3, windows-latest	1m 11s
Unit tests, PHP 8.5, ubuntu-latest	30s
Unit tests, PHP 8.3, ubuntu-latest	23s
Unit tests, PHP 8.4, ubuntu-latest	26s
Unit tests, PHP 8.4, windows-latest	1m 10s
Security checks	20s
Quality control	38s
Code coverage	6s
Cleanup artifacts	3s
	7m 18s

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