Fix regression for Maven 3.8.2 in v2.9.0

[ascopes]

Fix regression for path parsing in Maven 3.8.2.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.56%. Comparing base (f609750) to head (680f810).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #508   +/-   ##
=======================================
  Coverage   87.56%   87.56%           
=======================================
  Files          40       40           
  Lines        1310     1310           
  Branches       89       89           
=======================================
  Hits         1147     1147           
  Misses        122      122           
  Partials       41       41           

Files with missing lines	Coverage Δ
...protobufmavenplugin/mojo/AbstractGenerateMojo.java	100.00% <100.00%> (ø)