Remove SimpleSAMLphp as a direct dependency #536

Job	Run time
Linter / yaml-linter	5s
PHP-Linter (8.3) / linter	13s
PHP-Linter (8.4) / linter	10s
Linter / json-linter	27s
PHP-Linter (8.5) / linter	16s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.3, ubuntu-latest	30s
Unit tests, PHP 8.3, windows-latest	1m 13s
Unit tests, PHP 8.5, windows-latest	1m 0s
Unit tests, PHP 8.4, ubuntu-latest	28s
Unit tests, PHP 8.4, windows-latest	1m 19s
Unit tests, PHP 8.5, ubuntu-latest	32s
Quality control	23s
Code coverage	8s
Security checks	19s
Cleanup artifacts	5s
	7m 8s

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