Auto merge of #101342 - saethlin:update-backtrace, r=Mark-Simulacrum

Update backtrace

Most notably, this pulls in rust-lang/backtrace-rs@ebc9a85, which is both a bugfix and a significant performance improvement for Miri, since fixing the bug makes `RUST_BACKTRACE=1` backtraces much smaller: rust-lang/miri#2273, rust-lang/miri-test-libstd#8

This also pulls in other commits which turn the backtrace-rs CI green. That's nice.