[docker-ptf]: Upgrade scapy to 2.4.5 in docker-ptf (#10507)

Why I did it
Existing dataplane tests cannot be tested under MACsec environment due to the traffic under MACsec link is encrypted. So, I will override the dp_poll of ptf to MACsec dp_poll to decrypt the MACsec packets on injected ports (PR: Azure/sonic-mgmt#5490). MACsec decryption library depends on scapy 2.4.5.

How I did it
Upgrade scapy library to 2.4.5 by pip.

How to verify it
Check the scapy version in docker-ptf by

python -c "import scapy; print(scapy.__version__)"
2.4.5

Signed-off-by: Ze Gan <ganze718@gmail.com>

dockers/docker-ptf/Dockerfile.j2

@@ -119,7 +119,8 @@ RUN rm -rf /debs \
     && pip install pyrasite \
     && mkdir -p /opt       \
     && cd /opt             \
-    && wget https://raw.githubusercontent.com/p4lang/ptf/master/ptf_nn/ptf_nn_agent.py
+    && wget https://raw.githubusercontent.com/p4lang/ptf/master/ptf_nn/ptf_nn_agent.py \
+    && pip install --upgrade --ignore-installed scapy==2.4.5
 
 ## Adjust sshd settings
 RUN mkdir /var/run/sshd \