tests: increase delay for waitpid test

tests: increase delay for waitpid test

In some test executions on s390x, the waitpid test fails because 1
gets printed before 2.

[  557s] --- /home/abuild/rpmbuild/BUILD/util-linux-2.39.2/tests/expected/misc/waitpid-normal	2023-06-14 09:11:15.910887765 +0000
[  557s] +++ /home/abuild/rpmbuild/BUILD/util-linux-2.39.2/tests/output/misc/waitpid-normal	2023-11-27 23:30:30.406675022 +0000
[  557s] @@ -1,4 +1,4 @@
[  557s]  3
[  557s] -2
[  557s]  1
[  557s] +2
[  557s]  4

Increase the time to print 1, so the test numbers are printed in
expected order.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>