Fix: Signature of closure

[localheinz]

This PR

• fixes the signatures of closures used in optional field definitions that are not invoked in tests

[codecov]

Codecov Report

Merging #361 into main will increase coverage by 0.54%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #361      +/-   ##
============================================
+ Coverage     98.41%   98.95%   +0.54%     
- Complexity       98      102       +4     
============================================
  Files            21       23       +2     
  Lines           252      288      +36     
============================================
+ Hits            248      285      +37     
+ Misses            4        3       -1     

Impacted Files	Coverage Δ	Complexity Δ
src/FieldDefinition/Reference.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/Count.php	100.00% <100.00%> (ø)	8.00 <8.00> (?)
src/Exception/InvalidCount.php	100.00% <100.00%> (ø)	1.00 <1.00> (?)
src/Exception/InvalidDefinition.php	100.00% <100.00%> (ø)	3.00 <3.00> (+2.00)
src/Exception/InvalidMaximum.php	100.00% <100.00%> (ø)	1.00 <1.00> (?)
src/Exception/InvalidMinimum.php	100.00% <100.00%> (ø)	1.00 <1.00> (?)
src/FieldDefinition.php	100.00% <100.00%> (ø)	9.00 <1.00> (-2.00)
src/FieldDefinition/References.php	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
src/FixtureFactory.php	97.82% <100.00%> (-0.41%)	45.00 <19.00> (+3.00)	⬇️
src/Strategy/DefaultStrategy.php	100.00% <100.00%> (ø)	4.00 <4.00> (?)
... and 4 more

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