Deadlock when working with jobs inside a job

Hi.

• The following example code schedules two jobs that print "Hello" and "World" every sec.
• The third job should print the status of all scheduled jobs every 5 sec.
• During the first exeution of show_jobstats, a deadlock happens and the job never returns.

import datetime as dt
import time
from scheduler import Scheduler

def do_print(what: str) -> None:
    print(what)

def show_jobstats(sched: Scheduler) -> None:
    for job in sched.get_jobs():
        print("Job stats -> " + str(job))

schedule = Scheduler()
schedule.cyclic(dt.timedelta(seconds=1), do_print, args=("Hello",))
schedule.cyclic(dt.timedelta(seconds=1), do_print, args=("World",))
schedule.cyclic(dt.timedelta(seconds=5), show_jobstats, args=(schedule,))

while True:
    schedule.exec_jobs()
    time.sleep(1)

Output:

# python3 test.py 
Hello
World
Hello
World
Hello
World
Hello
World
Hello
World
^C
Traceback (most recent call last):
Job stats -> CYCLIC, do_print(..), at=2022-12-02 14:27:04, tz=None, in=-0:00:09, #5/inf, w=1
  File "//test.py", line 18, in <module>
    schedule.exec_jobs()
  File "/usr/local/lib/python3.11/site-packages/scheduler/threading/scheduler.py", line 264, in exec_jobs
    return self.__exec_jobs(filtered_jobs, ref_dt)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/scheduler/threading/scheduler.py", line 205, in __exec_jobs
    que.join()
  File "/usr/local/lib/python3.11/queue.py", line 90, in join
    self.all_tasks_done.wait()
  File "/usr/local/lib/python3.11/threading.py", line 320, in wait
    waiter.acquire()
KeyboardInterrupt
...