Merge ElementsProject/rust-elements#287: Automated weekly update to r… #794

Job	Run time
Test 32-bit version	48s
Cross test	1m 38s
Test - nightly toolchain (recent)	5m 56s
Docs - nightly toolchain	30m 12s
Test - msrv toolchain (recent)	1m 53s
Test - stable toolchain (recent)	5m 59s
Check WASM	29s
Docs - stable toolchain	1m 39s
Lint - nightly toolchain	2m 21s
Bench - nightly toolchain	2m 16s
	53m 11s

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