OpenSAML expects type long representing millis for response time validation skew

Fixes gh-7448

#7448

Author: fhanik

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/authentication/OpenSamlAuthenticationProvider.java

@@ -253,7 +253,7 @@ private boolean isValidAssertion(String recipient, Assertion a, Saml2Authenticat
 		validationParams.put(SAML2AssertionValidationParameters.SIGNATURE_REQUIRED, false);
 		validationParams.put(
 				SAML2AssertionValidationParameters.CLOCK_SKEW,
-				this.responseTimeValidationSkew
+				this.responseTimeValidationSkew.toMillis()
 		);
 		validationParams.put(
 				SAML2AssertionValidationParameters.COND_VALID_AUDIENCES,