Upgrade saml2-lib #229

Job	Run time
PHP-Linter (8.3) / linter	10s
PHP-Linter (8.4) / linter	13s
Linter / json-linter	34s
Linter / yaml-linter	8s
PHP-Linter (8.5) / linter	11s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.5, ubuntu-latest	23s
Unit tests, PHP 8.4, windows-latest	1m 10s
Unit tests, PHP 8.3, windows-latest	1m 11s
Unit tests, PHP 8.4, ubuntu-latest	23s
Unit tests, PHP 8.3, ubuntu-latest	24s
Unit tests, PHP 8.5, windows-latest	1m 34s
Security checks	25s
Code coverage	12s
Quality control	36s
Cleanup artifacts	6s
	7m 40s

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