Fix type warning in test #13507

Job	Run time
Windows Server 2019, Erlang/OTP 28.1	7m 5s
Check POSIX-compliant	16s
Windows Server 2019, Erlang/OTP 26.2	6m 43s
Check Licence Compliance	8m 43s
Ubuntu 24.04, Erlang/OTP 28.1 (deterministic)	6m 1s
Ubuntu 24.04, Erlang/OTP 27.3	4m 38s
Ubuntu 24.04, Erlang/OTP 28.1	5m 43s
Ubuntu 24.04, Erlang/OTP 28.1 (coverage)	7m 8s
Windows Server 2019, Erlang/OTP 27.3	6m 53s
Ubuntu 24.04, Erlang/OTP 26.0	1m 45s
Ubuntu 24.04, Erlang/OTP 27.0	5m 3s
Ubuntu 24.04, Erlang/OTP master	1m 40s
Ubuntu 24.04, Erlang/OTP maint	1m 41s
	1h 3m 19s

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