Fix: Remove $targetPhpVersion field and targetPhpVersion() method

[localheinz]

This pull request

• removes the $targetPhpVersion field and targetPhpVersion() method from AbstractRuleSet

[codecov]

Codecov Report

Merging #866 (0da5ec9) into main (7bbd6d1) will decrease coverage by 3.13%.
The diff coverage is 92.59%.

❗ Current head 0da5ec9 differs from pull request most recent head 545b7ed. Consider uploading reports for the commit 545b7ed to get more accurate results

@@              Coverage Diff              @@
##                main     #866      +/-   ##
=============================================
- Coverage     100.00%   96.87%   -3.13%     
- Complexity         7       18      +11     
=============================================
  Files              2       14      +12     
  Lines             41       64      +23     
=============================================
+ Hits              41       62      +21     
- Misses             0        2       +2     

Files Changed	Coverage Δ
src/RuleSet/Php82.php	0.00% <0.00%> (ø)
src/RuleSet/AbstractRuleSet.php	100.00% <100.00%> (ø)
src/RuleSet/Php53.php	100.00% <100.00%> (ø)
src/RuleSet/Php54.php	100.00% <100.00%> (ø)
src/RuleSet/Php55.php	100.00% <100.00%> (ø)
src/RuleSet/Php56.php	100.00% <100.00%> (ø)
src/RuleSet/Php70.php	100.00% <100.00%> (ø)
src/RuleSet/Php71.php	100.00% <100.00%> (ø)
src/RuleSet/Php72.php	100.00% <100.00%> (ø)
src/RuleSet/Php73.php	100.00% <100.00%> (ø)
... and 3 more

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