Automated daily update to rustc (to nightly-2026-03-21) #653

Job	Run time
Docs - stable toolchain (recent)	44s
Test - stable toolchain	2m 59s
Prepare	4s
Check WASM	36s
Docs - nightly toolchain (recent)	28s
Lint - nightly toolchain (recent)	37s
Test - nightly toolchain	2m 46s
Test - MSRV	5m 20s
	13m 34s

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