Automated daily update to rustc (to nightly-2026-04-04) #656

Job	Run time
Docs - stable toolchain (recent)	36s
Test - stable toolchain	2m 39s
Prepare	5s
Check WASM	28s
Test - MSRV	9m 48s
Docs - nightly toolchain (recent)	26s
Test - nightly toolchain	2m 42s
Lint - nightly toolchain (recent)	33s
	17m 17s

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