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"humans will evolve into a more heat resilient species."

Only if the ones who can't handle the higher temperature somehow die and/or struggle to reproduce, rather than turn up the air conditioning.

This will probably happen in Africa.

Epigenetics also play a role in our adaption: https://www.whatisepigenetics.com/exposure-to-cold-temperatu...

Intelligent Lamarckism?

It would require conditions where those who are better adapted to higher temperature produce more offspring than those who aren't, consistently over many generations. The Nepalese would have developed this change over thousands, if not tens of thousand of years. The climate crisis is likely to come to a burning head in the next hundred. In all likelihood, we'll use technology to circumnavigate the issue and it will never get to the point where humans are put into a position where adaptation occurs.

> why shouldn't that be possible?

Evolution "cares" about one and only one thing - spreading of relevant genes. Technological advances means there's almost no difference in terms of procreation between more and less heat tolerant people.