fix(date picker): detect change range interval console error (carbon-…

…design-system#11532)

### Related Ticket(s)

Closes carbon-design-system#11490

### Description

In Date picker element, dev tool console shows error `Uncaught TypeError: fp.getDateStr is not a function`.

### Changelog

**Removed**

- Removed custom event handling function.

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packages/carbon-web-components/package.json

@@ -74,7 +74,7 @@
     "@carbon/styles": "1.51.0",
     "@floating-ui/dom": "^1.6.3",
     "@ibm/telemetry-js": "^1.2.1",
-    "flatpickr": "4.6.1",
+    "flatpickr": "4.6.13",
     "lit": "^2.7.6",
     "lodash-es": "^4.17.21"
   },

packages/carbon-web-components/src/components/date-picker/range-plugin.ts

@@ -105,7 +105,6 @@ export default (config: Config): Plugin => {
           fp._hBXCEDatePickerRangePluginOnBlurTo.release();
       }
     };
-
     return Object.assign(origRangePlugin, {
       onReady() {
         origOnReady.call(this);