Where is my jQuery loaded?

You will want to use a child theme; along with a custom function.

Here is the codex page on enqueue scripts.

The custom function will dequeue the jquery included with WordPress; and allow you to enqueue your own.

Here is a link with the function; and also a big reason why this is NOT considered a good idea ?? (read the comments as well)

https://pippinsplugins.com/why-loading-your-own-jquery-is-irresponsible/