Revert "Bump Go version to 1.23.6 (#30242)" (#30359)

This reverts commit acbbd4c58d.

server/channels/app/saml.go

@@ -232,19 +232,19 @@ func (a *App) BuildSamlMetadataObject(idpMetadata []byte) (*model.SamlMetadataRe
 	data := &model.SamlMetadataResponse{}
 	data.IdpDescriptorURL = entityDescriptor.EntityID
 
-	if len(entityDescriptor.IDPSSODescriptors) == 0 {
+	if entityDescriptor.IDPSSODescriptors == nil || len(entityDescriptor.IDPSSODescriptors) == 0 {
 		err := model.NewAppError("BuildSamlMetadataObject", "api.admin.saml.invalid_xml_missing_idpssodescriptors.app_error", nil, "", http.StatusInternalServerError)
 		return nil, err
 	}
 
 	idpSSODescriptor := entityDescriptor.IDPSSODescriptors[0]
-	if len(idpSSODescriptor.SingleSignOnServices) == 0 {
+	if idpSSODescriptor.SingleSignOnServices == nil || len(idpSSODescriptor.SingleSignOnServices) == 0 {
 		err := model.NewAppError("BuildSamlMetadataObject", "api.admin.saml.invalid_xml_missing_ssoservices.app_error", nil, "", http.StatusInternalServerError)
 		return nil, err
 	}
 
 	data.IdpURL = idpSSODescriptor.SingleSignOnServices[0].Location
-	if len(idpSSODescriptor.SSODescriptor.RoleDescriptor.KeyDescriptors) == 0 {
+	if idpSSODescriptor.SSODescriptor.RoleDescriptor.KeyDescriptors == nil || len(idpSSODescriptor.SSODescriptor.RoleDescriptor.KeyDescriptors) == 0 {
 		err := model.NewAppError("BuildSamlMetadataObject", "api.admin.saml.invalid_xml_missing_keydescriptor.app_error", nil, "", http.StatusInternalServerError)
 		return nil, err
 	}