chore: bump snapshot version to 25.1

[platosha]

Following vaadin/flow#22930, this change updates the snapshot version number to 25.1 for Hilla artifacts.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.33%. Comparing base (c6c8fd0) to head (a4aa068).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4472   +/-   ##
=======================================
  Coverage   86.33%   86.33%           
=======================================
  Files         123      123           
  Lines        8472     8472           
  Branches     1301     1301           
=======================================
  Hits         7314     7314           
  Misses       1135     1135           
  Partials       23       23           

Flag	Coverage Δ
unittests	86.33% <ø> (ø)

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