Fix ci breaking due to new dependencies and rustc changes (backport to 0.6) #416

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Job	Run time
Clippy (stable)	28s
Rustfmt (stable)	16s
Check (stable)	46s
Miri	1m 25s
Test Suite (stable)	40s
Test Suite	1m 30s
Test Suite (stable, --no-default-features)	37s
Test Suite (ubuntu-latest)	37s
Test Suite (--no-default-features)	1m 30s
Test Suite (stable, --features track-caller)	37s
Test Suite (windows-latest)	1m 18s
Test Suite (--features track-caller)	1m 31s
Test Suite (stable, --features pyo3)	37s
Test Suite (macOS-latest)	1m 48s
Test Suite (--features auto-install)	1m 31s
Test Suite (stable, --features auto-install)	37s
Test Suite (stable, --all-features)	38s
Test Suite (beta)	34s
Test Suite (beta, --no-default-features)	34s
Test Suite (beta, --features track-caller)	37s
Test Suite (beta, --features pyo3)	35s
Test Suite (beta, --features auto-install)	43s
Test Suite (beta, --all-features)	40s
Test Suite (nightly)	47s
Test Suite (nightly, --no-default-features)	48s
Test Suite (nightly, --features track-caller)	47s
Test Suite (nightly, --features pyo3)	48s
Test Suite (nightly, --features auto-install)	46s
Test Suite (nightly, --all-features)	44s
	24m 49s

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