Update to the new backtrace API #322

Job	Run time
Test Suite	4m 19s
Test Suite (ubuntu-latest)	48s
Test Suite (--no-default-features)	4m 16s
Check (stable)	23s
Test Suite (--features track-caller)	4m 18s
Test Suite (windows-latest)	1m 32s
Clippy (stable)	29s
Test Suite (--features auto-install)	4m 19s
Test Suite (macOS-latest)	1m 15s
Miri	1m 12s
Test Suite (stable)	42s
Rustfmt (stable)	15s
Test Suite (stable, --no-default-features)	46s
Test Suite (stable, --features track-caller)	46s
Test Suite (stable, --features pyo3)	43s
Test Suite (stable, --features auto-install)	44s
Test Suite (stable, --all-features)	44s
Test Suite (beta)	42s
Test Suite (beta, --no-default-features)	46s
Test Suite (beta, --features track-caller)	43s
Test Suite (beta, --features pyo3)	43s
Test Suite (beta, --features auto-install)	44s
Test Suite (beta, --all-features)	45s
Test Suite (nightly)	41s
Test Suite (nightly, --no-default-features)	42s
Test Suite (nightly, --features track-caller)	41s
Test Suite (nightly, --features pyo3)	45s
Test Suite (nightly, --features auto-install)	44s
Test Suite (nightly, --all-features)	45s
	36m 12s

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