Use a local copy of Message:addSign that uses the xmlsecurity-library… #177

Job	Run time
Linter / style-linter	0s
PHP-Linter (8.1) / linter	13s
PHP-Linter (8.2) / linter	11s
PHP-Linter (8.3) / linter	14s
PHP-Linter (8.4) / linter	11s
Linter / ecmascript-linter	-1s
Linter / json-linter	31s
Linter / yaml-linter	4s
Unit tests, PHP 8.4, ubuntu-latest	42s
Unit tests, PHP 8.3, ubuntu-latest	22s
Unit tests, PHP 8.2, ubuntu-latest	22s
Unit tests, PHP 8.3, windows-latest	1m 2s
Unit tests, PHP 8.1, ubuntu-latest	19s
Unit tests, PHP 8.4, windows-latest	56s
Unit tests, PHP 8.1, windows-latest	1m 4s
Unit tests, PHP 8.2, windows-latest	59s
Quality control	34s
Security checks	24s
Code coverage	6s
Cleanup artifacts	3s
	8m 16s

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