Fix: Extract constant

[localheinz]

This pull request

• extracts a constant

Follows #481.

[codecov]

Codecov Report

Merging #482 (bb9bce7) into main (15de43b) will not change coverage.
The diff coverage is n/a.

❗ Current head bb9bce7 differs from pull request most recent head b3f4b34. Consider uploading reports for the commit b3f4b34 to get more accurate results

@@             Coverage Diff             @@
##                main      #482   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         7         7           
===========================================
  Files              2         2           
  Lines             26        26           
===========================================
  Hits              26        26           

Impacted Files	Coverage Δ
src/RuleSet/AbstractRuleSet.php	100.00% <ø> (ø)

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