Custom Objects Importer error regeneratorRuntime is not defined

### Support reference number

N/A

### Description

Custom Objects Importer version 3.0.40 fails due to missing Object / Function.

```js
[OMITTED]/node_modules/@commercetools/custom-objects-importer/lib/main.js:151
var _processBatches2 = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(objects) {
^

ReferenceError: regeneratorRuntime is not defined
at [OMITTED]/node_modules/@commercetools/custom-objects-importer/lib/main.js:151:62
at [OMITTED]/node_modules/@commercetools/custom-objects-importer/lib/main.js:193:6
at Object. ([OMITTED]/node_modules/@commercetools/custom-objects-importer/lib/main.js:369:2)
at Module._compile (internal/modules/cjs/loader.js:1085:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
at Module.load (internal/modules/cjs/loader.js:950:32)
at Function.Module._load (internal/modules/cjs/loader.js:790:12)
at Module.require (internal/modules/cjs/loader.js:974:19)
at require (internal/modules/cjs/helpers.js:101:18)
at Object. ([OMITTED]/index.js:2:31)
at Module._compile (internal/modules/cjs/loader.js:1085:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
at Module.load (internal/modules/cjs/loader.js:950:32)
at Function.Module._load (internal/modules/cjs/loader.js:790:12)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)
at internal/main/run_main_module.js:17:47
error Command failed with exit code 1.
```

Node: 16.14.2
NPM: 6.14.7

### Expected Behavior

Importer executes without error.

### Current Behavior

Importer fails.

### Context

This failure has prevented our company from being able to import important information needed to best serve our customers.

### Possible Solution

The small amount of research I did around this suggests some kind of bundler related issue. Suggest looking at Babel or Webpack bundle steps.

Reproduziere den Fehler mit Node 16.14.2 und npm 6.14.7 und untersuche anschließend lib/main.js um Zeile 151 herum sowie die im Bericht erwähnten Babel- oder Webpack-Bundle-Schritte. Erledigt ist die Aufgabe, wenn der Custom Objects Importer ohne den regeneratorRuntime-Fehler ausgeführt wird.

Vom Indexierungsmodell aus dem Issue-Text verfasst.