Revert "Saml: Security update simplesaml -> 2.3.7"

This reverts commit 3b0b406.

Author: mjansenDatabay

composer.json

@@ -9,8 +9,7 @@
 		"allow-plugins": {
 			"simplesamlphp/composer-module-installer": true,
 			"cweagans/composer-patches": true,
-			"captainhook/plugin-composer": true,
-			"simplesamlphp/composer-xmlprovider-installer": false
+			"captainhook/plugin-composer": true
 		}
 	},
 	"scripts": {
@@ -54,7 +53,7 @@
 		"phpmailer/phpmailer": "^6.8",
 		"geshi/geshi": "^1.0.9.1",
 		"pimple/pimple" : "^3.0",
-		"symfony/yaml": "^6.0",
+		"symfony/yaml": "^5.3",
 		"guzzlehttp/psr7": "^2.5",
 		"psr/http-message": "^1.0",
 		"dflydev/fig-cookies": "^3.0",
@@ -64,12 +63,12 @@
 		"phpoffice/phpspreadsheet": "^2.2",
 		"jumbojett/openid-connect-php": "^1.0.0",
 		"sabre/dav": "^4.1",
-		"symfony/console" : "^6.0",
+		"symfony/console" : "^5.0",
 		"slim/slim": "^3.11",
 		"ramsey/uuid": "4.4.0",
 		"enshrined/svg-sanitize": "^0.16.0",
 		"guzzlehttp/guzzle": "^7.0",
-		"simplesamlphp/simplesamlphp": "^2.3.7",
+		"simplesamlphp/simplesamlphp": "^2.0.15",
 		"seld/jsonlint": "^1.8",
 		"jasig/phpcas": "^1.4",
 		"league/commonmark": "^2.3",