Fix valgrind job #1451

Job	Run time
Valgrind	1m 11s
Windows CMake, Debug configuration	1m 57s
Clippy nightly (optional)	19s
Build+test (clang, stable, ubuntu-latest)	54s
Clippy	18s
Build+test (clang, beta, ubuntu-latest)	1m 6s
Check for documentation errors	18s
ensure-header-updated	1m 0s
Format	15s
Check minimum versions	41s
Build+test (clang, nightly, ubuntu-latest)	58s
Windows CMake, Release configuration	2m 36s
Build+test (clang, 1.61.0, ubuntu-latest)	2m 0s
Build+test (gcc, stable, ubuntu-latest)	51s
cargo-c	42s
Build+test (gcc, beta, ubuntu-latest)	49s
Build+test (gcc, nightly, ubuntu-latest)	51s
Build+test (gcc, 1.61.0, ubuntu-latest)	1m 56s
Miri	54s
Clang Tidy	8s
Build+test (macos-latest, clang, stable)	1m 46s
	21m 30s

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