Support ETS 4.1 project files

[farmio]

ETS 4.1.6 (Build 3250) seems to use the same schema version as 4.1 (Version 11), but the knx_master.xml lacks the <?xml version="1.0" encoding="UTF-8"?> first line. So we have to check first and second line for the namespace (we skipped first line previously).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.37%. Comparing base (dfcccc3) to head (726f4ab).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #476   +/-   ##
=======================================
  Coverage   95.37%   95.37%           
=======================================
  Files          22       22           
  Lines        1275     1276    +1     
=======================================
+ Hits         1216     1217    +1     
  Misses         59       59           

Files with missing lines	Coverage Δ
xknxproject/const.py	100.00% <100.00%> (ø)
xknxproject/zip/extractor.py	91.95% <100.00%> (+0.09%)	⬆️