Automated daily update to rustc (to nightly-2025-12-20) #630

Job	Run time
Prepare	5s
Docs - stable toolchain (recent)	43s
Check WASM	32s
Test - stable toolchain	2m 43s
Test - nightly toolchain	2m 57s
Docs - nightly toolchain (recent)	28s
Test - MSRV	7m 58s
Lint - nightly toolchain (recent)	39s
	16m 5s

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