Fix `timer:sleep/1` spec #18922

Job	Run time
Event File	3s
Build Erlang/OTP (64-bit)	5m 2s
Build Erlang/OTP (iOS)	3m 34s
Build Erlang/OTP (Types and Flavors)	9m 50s
Build Erlang/OTP (macOS)	3m 9s
Build Erlang/OTP (Windows)	17m 28s
Build and check documentation	4m 51s
Build Erlang/OTP (32-bit)	8m 56s
Run static analysis	6m 17s
Build Erlang/OTP (cross-compile)	15m 14s
Test Erlang/OTP (stdlib)	1h 6m 29s
Build Erlang/OTP (clang)	5m 21s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	8m 17s
	2h 34m 31s

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