Not sure about that. Outside temperature above 37 were common in many highly populated areas, even before "high temperature summer" (e.g., India, Indonesia, most of Brazil, etc.). If there was an actual selection pressure, we would have seen its results by now.

We have already seen selection pressure results in Candida auris

https://journals.asm.org/doi/10.1128/mbio.01397-19 (2019)

https://radiolab.org/podcast/fungus-amungus (2020)

Would a daily peak above 37C counts for the parents point? It has to be longer term temperature I imagine.