test_tail: increase delay for test_follow_name_move_create2

[jhscheer]

Increase delay for this test to be more resillient against
load-jitter on the CI test VMs.

I hope this helps to solve #2695 (comment)

[sylvestre]

Happened again here:

https://github.com/uutils/coreutils/runs/6838926336?check_suite_focus=true

---- test_tail::test_follow_name_move_create2 stdout ----
current_directory_resolved: 
touch: /tmp/.tmp7VSGCz/1
touch: /tmp/.tmp7VSGCz/2
touch: /tmp/.tmp7VSGCz/3
touch: /tmp/.tmp7VSGCz/4
touch: /tmp/.tmp7VSGCz/5
touch: /tmp/.tmp7VSGCz/6
touch: /tmp/.tmp7VSGCz/7
touch: /tmp/.tmp7VSGCz/8
touch: /tmp/.tmp7VSGCz/9
run: /home/runner/work/coreutils/coreutils/target/debug/coreutils tail -s.1 --max-unchanged-stats=1 -q -F 1 2 3 4 5 6 7 8 9
write(truncate): /tmp/.tmp7VSGCz/9
rename: "/tmp/.tmp7VSGCz/1" "/tmp/.tmp7VSGCz/f"
write(truncate): /tmp/.tmp7VSGCz/1
remove: "/tmp/.tmp7VSGCz/f"
run: /home/runner/work/coreutils/coreutils/target/debug/coreutils tail -s.1 --max-unchanged-stats=1 -q -F 1 2 3 4 5 6 7 8 9 ---disable-inotify
write(truncate): /tmp/.tmp7VSGCz/9
rename: "/tmp/.tmp7VSGCz/1" "/tmp/.tmp7VSGCz/f"
write(truncate): /tmp/.tmp7VSGCz/1
thread 'test_tail::test_follow_name_move_create2' panicked at 'assertion failed: `(left == right)`
  left: `"tail: '1' has become inaccessible: No such file or directory\ntail: 1: file truncated\n"`,
 right: `"tail: '1' has become inaccessible: No such file or directory\ntail: '1' has appeared;  following new file\n"`', /home/runner/work/coreutils/coreutils/tests/by-util/test_tail.rs:1898:9