ci: Pin scapy version.

The latest scapy version (2.6.0) fails to properly evaulate if
.config directory already exists [0]. Pin the version to 2.5.0
for the time being as that one was working without any issues.

[0] secdev/scapy#4546
Signed-off-by: Ales Musil <amusil@redhat.com>
Signed-off-by: Mark Michelson <mmichels@redhat.com>

utilities/containers/py-requirements.txt

@@ -1,5 +1,5 @@
 flake8==5.0.4
-scapy
+scapy==2.5.0
 sphinx
 setuptools
 pyelftools