Fix WANPPPC service_type

[unconnected]

Fix for issue #256

[StevenLooman]

You'll need to create a Towncrier/change file to fix the CI, as described at: https://github.com/StevenLooman/async_upnp_client/blob/development/README.rst?plain=1#L76

[codecov]

Codecov Report

Attention: Patch coverage is 6.25000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 71.97%. Comparing base (bfe1843) to head (ffd639b).
Report is 2 commits behind head on development.

Files with missing lines	Patch %	Lines
async_upnp_client/profiles/igd.py	6.25%	15 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #257      +/-   ##
===============================================
- Coverage        71.98%   71.97%   -0.01%     
===============================================
  Files               18       18              
  Lines             4230     4236       +6     
===============================================
+ Hits              3045     3049       +4     
- Misses            1185     1187       +2     

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[StevenLooman]

Merged! Thank you for this PR.