docs: update version dropdown label to 1.4.0 (#16232)

Author: otto-the-otter-bot[bot]

docs-website/docusaurus.config.js

@@ -338,7 +338,7 @@ module.exports = {
           lastVersion: "current",
           versions: {
             current: {
-              label: "1.3.0",
+              label: "1.4.0",
               banner: 'none',
             },
           },