fix gradle plugin source jar

[taefi]

After renaming the dev.hilla to com.vaadin.hilla
the config for sources-jar inclusion was still
pointing to dev/**

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a28d45a) 95.30% compared to head (91ad7dc) 95.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2014   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files          52       52           
  Lines        3495     3495           
  Branches      527      527           
=======================================
  Hits         3331     3331           
  Misses        129      129           
  Partials       35       35           

Flag	Coverage Δ
unittests	95.30% <ø> (ø)

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