fix: increase loop iteration count in event_find_curr function

[arthur-zhang]

Maybe current loop count is too small.

Description

For example, in the popular orbstack(https://orbstack.dev/) implementation. Starting from the current process to the process with pid 1, it takes 5 steps to find the parent processes. Change the loop count to a higher value make tetragon work in orbstack vms.

zsh-79260   [007] ....1 80569.428901: bpf_trace_printk: >>>>__event_find_parent: fork, pid=28997, value is null:1
 zsh-79260   [007] ....1 80569.428901: bpf_trace_printk: >>>>__event_find_parent: fork, pid=544, value is null:1
 zsh-79260   [007] ....1 80569.428902: bpf_trace_printk: >>>>__event_find_parent: fork, pid=508, value is null:1
 zsh-79260   [007] ....1 80569.428902: bpf_trace_printk: >>>>__event_find_parent: fork, pid=507, value is null:1
 zsh-79260   [007] ....1 80569.428902: bpf_trace_printk: >>>>__event_find_parent: fork, pid=1, value is null:0

Changelog

increase loop iteration count in event_find_curr function from 4 to 8

[mtardy]

Hey, seeing this PR now, what made you closed it in the end, the problem was resolved?

[arthur-zhang]

I found that maybe I misunderstand some code, so i close the pr. Sorry for bother you.