Update version and package

Author: linev

demo/node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "jsroot-demos",
-  "version": "7.7.6",
+  "version": "7.7.7",
   "engines": {
     "node": ">=0.18"
   },

modules/core.mjs

@@ -1,10 +1,10 @@
 /** @summary version id
   * @desc For the JSROOT release the string in format 'major.minor.patch' like '7.0.0' */
-const version_id = '7.7.6',
+const version_id = '7.7.x',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '26/03/2025',
+version_date = '21/10/2025',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}