Hello everyone,
I am getting the exact same error, and have what looks to be the same computer as you(m1 MacBook Pro, 8gb unified memory, 256GB storage, running macOS Big Sur.).
I also tried redownloading java, the jdk, minecraft, and forge. Nothing has worked so far. I have Airplay turned off and have never even used it.
However, I did try a very old version of forge for minecraft 1.12.2, back when the forge loading screen was white with multiple loading bars, and that worked fine!
Every version with the red loading screen showing the memory heap on top has crashed during this loading.
