Without python3-requests, ksc will fail with
```
Traceback (most recent call last):
File "/usr/share/ksc/ksc.py", line 16, in <module>
from utils import run, read_list
File "/usr/share/ksc/utils.py", line 24, in <module>
from bugzilla import Bugzilla, BugzillaError
File "/usr/share/ksc/bugzilla/__init__.py", line 13, in <module>
from .base import Bugzilla
File "/usr/share/ksc/bugzilla/base.py", line 39, in <module>
from .transport import BugzillaError, _BugzillaServerProxy, _RequestsTransport
File "/usr/share/ksc/bugzilla/transport.py", line 21, in <module>
import requests
ModuleNotFoundError: No module named 'requests'
```
So adding python3-requests into Requires in case it is not pre-installed.
Resolves: rhbz#1966411
Signed-off-by: Ziqian SUN (Zamir) <zsun@redhat.com>
