Set version to 5.26.0

CRM/Upgrade/Incremental/sql/5.26.0.mysql.tpl

+{* file to handle db changes in 5.26.0 during upgrade *}

sql/civicrm_generated.mysql

@@ -399,7 +399,7 @@ UNLOCK TABLES;
 LOCK TABLES `civicrm_domain` WRITE;
 /*!40000 ALTER TABLE `civicrm_domain` DISABLE KEYS */;
-INSERT INTO `civicrm_domain` (`id`, `name`, `description`, `version`, `contact_id`, `locales`, `locale_custom_strings`) VALUES (1,'Default Domain Name',NULL,'5.26.beta1',1,NULL,'a:1:{s:5:\"en_US\";a:0:{}}');
+INSERT INTO `civicrm_domain` (`id`, `name`, `description`, `version`, `contact_id`, `locales`, `locale_custom_strings`) VALUES (1,'Default Domain Name',NULL,'5.26.0',1,NULL,'a:1:{s:5:\"en_US\";a:0:{}}');
 /*!40000 ALTER TABLE `civicrm_domain` ENABLE KEYS */;
 UNLOCK TABLES;

xml/version.xml

 <?xml version="1.0" encoding="iso-8859-1" ?>
 <version>
-  <version_no>5.26.beta1</version_no>
+  <version_no>5.26.0</version_no>
 </version>