[Build] Fix the python module importlib.metadata not found issue (son…

…ic-net#15800)

Why I did it
It is to fix the docker-ptf-sai build failure.
https://dev.azure.com/mssonic/build/_build/results?buildId=311315&view=logs&j=cef3d8a9-152e-5193-620b-567dc18af272&t=cf595088-5c84-5cf1-9d7e-03331f31d795

2023-07-09T13:53:19.9025355Z �[91mTraceback (most recent call last):
2023-07-09T13:53:19.9025715Z   File "/root/ptf/.eggs/setuptools_scm-7.1.0-py3.7.egg/setuptools_scm/_entrypoints.py", line 74, in <module>
2023-07-09T13:53:19.9025933Z     from importlib.metadata import entry_points  # type: ignore
2023-07-09T13:53:19.9026167Z ModuleNotFoundError: No module named 'importlib.metadata'
Work item tracking
Microsoft ADO (number only): 24513583
How I did it
How to verify it

dockers/docker-ptf-sai/Dockerfile.j2

@@ -18,6 +18,7 @@ RUN pip3 install crc16          \
         psutil                  \
         scapy_helper            \
         pysubnettree            \
+        importlib-metadata      \
         xmlrunner
 
 COPY \