ci: install scapy-rpc on Packit

[evverx]

to prevent the tests from failing with

 ###(000)=[failed] [C706 MGMT] - Import layer
 ...
 ModuleNotFoundError: No module named 'scapy.layers.msrpce.raw.mgmt'

 ###(001)=[failed] [C706 MGMT] - Dissect rpc__mgmt_inq_if_ids_Response
 ...
 >>> pkt = rpc__mgmt_inq_if_ids_Response(DATA)
 NameError: name 'rpc__mgmt_inq_if_ids_Response' is not defined

scapy-rpc isn't packaged so it has to be installed using pip instead of Build-Requires as usual.

It's a follow-up to #4921.

It was tested in https://copr.fedorainfracloud.org/coprs/packit/evverx-scapy-2/build/10159677/.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.69%. Comparing base (c9c91ba) to head (b722633).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4930   +/-   ##
=======================================
  Coverage   80.69%   80.69%           
=======================================
  Files         370      370           
  Lines       91759    91759           
=======================================
+ Hits        74041    74044    +3     
+ Misses      17718    17715    -3     

see 4 files with indirect coverage changes

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[gpotter2]

Thanks a lot !