Fix ConcurrentModificationException in SnapshotDependenciesChecker

[imvs]

Hi, this helps to avoid ConcurrentModificationException in SnapshotDependenciesChecker.snapshotVersions.
Related issue #818

[bgalek]

LGTM, thx!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 64.21%. Comparing base (428ee60) to head (4e6ca3e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../release/domain/SnapshotDependenciesChecker.groovy	0.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #819      +/-   ##
============================================
- Coverage     64.53%   64.21%   -0.32%     
  Complexity      442      442              
============================================
  Files            82       82              
  Lines          1613     1621       +8     
  Branches        159      160       +1     
============================================
  Hits           1041     1041              
- Misses          503      511       +8     
  Partials         69       69              

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