Automated update to rustc nightly-2026-05-21 #692

Job	Run time
Cross test	1m 40s
Docs - nightly toolchain	1m 26s
Test 32-bit version	49s
Check WASM	36s
Docs - stable toolchain	1m 31s
Test - msrv toolchain (recent)	1m 40s
Bench - nightly toolchain	2m 10s
Lint - nightly toolchain	1m 32s
Test - stable toolchain (recent)	5m 51s
Test - nightly toolchain (recent)	5m 12s
	22m 27s

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