Fix: Check if object is extensible

Refer https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cant_define_property_object_not_extensible

client/src/extension.ts

@@ -57,7 +57,7 @@ function updatePythonPath (): void {
   for (const pythonSubConf of ['autoComplete.extraPaths', 'analysis.extraPaths']) {
     const extraPaths = pythonConfig.get<string[]>(pythonSubConf) ?? []
     for (const pathToAdd of [pathToBitbakeLib, pathToPokyMetaLib]) {
-      if (!extraPaths.includes(pathToAdd)) {
+      if (!extraPaths.includes(pathToAdd) && Object.isExtensible(extraPaths)) {
         extraPaths.push(pathToAdd)
       }
       void pythonConfig.update(pythonSubConf, extraPaths, vscode.ConfigurationTarget.Workspace)