test

Bump rhysd/github-action-benchmark from 1.19.3 to 1.20.3 #278

Job	Run time
32bit tests	35s
Build & test (ubuntu-latest, stable)	34s
Build & test (ubuntu-latest, beta)	40s
Check it compiles on old Rust (1.31.0)	52s
Build & test (ubuntu-latest, nightly)	38s
Build & test (macos-latest, stable)	35s
Build & test (macos-latest, beta)	1m 1s
Verify benchmarks compile	53s
Build & test (macos-latest, nightly)	40s
Build & test (windows-latest, stable)	2m 14s
Run the big ignored tests	1m 11s
Build & test (windows-latest, beta)	2m 5s
Build & test (windows-latest, nightly)	2m 3s
Clippy lints	17s
Test with experimental-thread-local	42s
Check documentation links	18s
Check formatting	4s
Check it compiles on old Rust (1.45.0)	11s
Miri checks	7m 11s
Thread Sanitizer checks MacOS	14s
	22m 58s

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