Fix PSR-12 compliancy

config-templates/config.php

lib/SimpleSAML/Compat/Logger.php

lib/SimpleSAML/Kernel.php

lib/SimpleSAML/Logger/ErrorLogLoggingHandler.php

lib/SimpleSAML/Logger/FileLoggingHandler.php

lib/SimpleSAML/Logger/StandardErrorLoggingHandler.php

lib/SimpleSAML/Logger/SyslogLoggingHandler.php

lib/SimpleSAML/Module.php

lib/SimpleSAML/SessionHandlerPHP.php

lib/SimpleSAML/Store/SQLStore.php

lib/SimpleSAML/Utils/HTTP.php

lib/SimpleSAML/XHTML/Template.php

metadata-templates/saml20-sp-remote.php

modules/admin/lib/Controller/Config.php

modules/core/lib/Controller/Login.php

modules/multiauth/lib/Auth/Source/MultiAuth.php

modules/saml/lib/Message.php

modules/saml/lib/SP/LogoutStore.php

tests/bootstrap.php

tests/lib/SimpleSAML/Locale/LanguageTest.php