tests: timeout: increase delay on macOS for forward_sigint_to_child #22506

Job	Run time
Build and test uufuzz examples	1m 4s
Build the fuzzers	2m 32s
Fuzz (fuzz_date, true)	3m 20s
Fuzz (fuzz_sort, false)	2m 24s
Fuzz (fuzz_test, true)	3m 18s
Fuzz (fuzz_echo, true)	3m 33s
Fuzz (fuzz_env, false)	2m 18s
Fuzz (fuzz_tr, false)	2m 24s
Fuzz (fuzz_cut, false)	2m 24s
Fuzz (fuzz_printf, true)	3m 23s
Fuzz (fuzz_wc, false)	2m 18s
Fuzz (fuzz_seq, false)	2m 36s
Fuzz (fuzz_parse_glob, true)	3m 23s
Fuzz (fuzz_dirname, true)	3m 28s
Fuzz (fuzz_split, false)	2m 31s
Fuzz (fuzz_seq_parse_number, false)	2m 30s
Fuzz (fuzz_parse_time, false)	2m 37s
Fuzz (fuzz_expr, true)	3m 22s
Fuzz (fuzz_parse_size, false)	2m 34s
Fuzz (fuzz_non_utf8_paths, true)	3m 13s
Fuzz (fuzz_cksum, false)	2m 10s
Fuzzing Summary	6s
	57m 28s

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