Add python3-requests ksc.spec to Requires

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>

ksc.spec

@@ -8,7 +8,7 @@
 
 Name:		ksc
 Version:	1.8
-Release:	1%{?dist}
+Release:	2%{?dist}
 Summary:	Kernel source code checker
 Group:		Development/Tools
 AutoReqProv:	no
@@ -18,6 +18,7 @@ BuildArch:	noarch
 Requires:	kmod
 Requires:	binutils
 Requires:	kernel-devel
+Requires:	python3-requests
 BuildRequires:	python3-devel
 BuildRequires:	python3-setuptools
 Source0:	https://github.com/RedHatOfficial/ksc/archive/%{commit}/%{name}-%{shortcommit}.tar.gz
@@ -45,6 +46,9 @@ install -D ksc.1 %{buildroot}%{_mandir}/man1/ksc.1
 %{python3_sitelib}/ksc-%{version}*.egg-info
 
 %changelog
+* Tue Jun 01 2021 Ziqian SUN <zsun@redhat.com> - 1.8-2
+- Adding python3-requests into Requires.
+
 * Mon May 17 2021 Čestmír Kalina <ckalina@redhat.com> - 1.8-1
 - Resolves: #1954495 ksc: i18n issues