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Update backtrace
Most notably, this pulls in ebc9a85466, which is both a bugfix and a significant performance improvement for Miri, since fixing the bug makes `RUST_BACKTRACE=1` backtraces much smaller: https://github.com/rust-lang/miri/issues/2273, https://github.com/rust-lang/miri-test-libstd/issues/8
This also pulls in other commits which turn the backtrace-rs CI green. That's nice.