<details>
<summary> Limit pinejs-client-core to ~6.14.0, to fix errors in older TypeScript [Thodoris Greasidis] </summary>
> pinejs-client-js-6.14.0 - 2023-12-05
>
> * Respect the Retry-After header when clients define the getRetryAfterHeader option [Thodoris Greasidis]
>
> pinejs-client-js-6.13.0 - 2023-07-11
>
> * Add support for $duration [Thodoris Greasidis]
>
> pinejs-client-js-6.12.4 - 2023-05-09
>
> * Avoid an unnecessary function creation on each get() call [Thodoris Greasidis]
>
> pinejs-client-js-6.12.3 - 2022-12-28
>
> * CI: Convert tests to TypeScript [Josh Bowling]
>
> pinejs-client-js-6.12.2 - 2022-11-18
>
> * Fix `$orderby: { a: { $count: ... }, $dir: 'asc' }` typings [Thodoris Greasidis]
>
> pinejs-client-js-6.12.1 - 2022-11-15
>
> * Update TypeScript to 4.9.3 [Thodoris Greasidis]
>
</details>
* Fix the TypeScript incompatibility test [Thodoris Greasidis]