Bump backtrace to 0.3.72
This removes a bunch of dead code, contains critical aarch64-windows fixes, some less-critical windows-in-general improvements, adds visionOS support (and probably improves support for a bunch of Apple platforms...), and harmonizes backtrace's dependencies with rustc/std's.
See https://github.com/rust-lang/backtrace-rs/compare/0.3.71...0.3.72
r? `@ghost`