test

Bump parking_lot from 0.12.2 to 0.12.3 #287

Job	Run time
Check it compiles on old Rust (1.31.0)	55s
Verify benchmarks compile	57s
Run the big ignored tests	1m 11s
32bit tests	41s
Clippy lints	17s
Test with experimental-thread-local	37s
Check documentation links	8s
Miri checks	6m 11s
Check formatting	4s
Check it compiles on old Rust (1.45.0)	17s
Build & test (ubuntu-latest, stable)	34s
Thread Sanitizer checks MacOS	13s
Build & test (ubuntu-latest, beta)	40s
Build & test (ubuntu-latest, nightly)	42s
Build & test (macos-latest, stable)	44s
Build & test (macos-latest, beta)	51s
Build & test (macos-latest, nightly)	51s
Build & test (windows-latest, stable)	2m 6s
Build & test (windows-latest, beta)	1m 32s
Build & test (windows-latest, nightly)	1m 55s
	21m 26s

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