Auto merge of #140705 - LegNeato:backtracelock, r=Mark-Simulacrum

Update `backtrace` in Cargo.lock

Ran `cargo update -p backtrace`. This is needed to forward port the rust-gpu compiler backend.

Subsumes rust-lang/rust#140631. Was supposed to be fixed by rust-lang/rust#140353, but there were test failures and the backtrace update was backed out.

Author: bors