Fix PHPStan

[dereuromark]

PHPStan latest version seems to make master red

This fixes the issues for <=8.1

For 8.2 we first need to add the version into CI matrix and then fix the following:

 ------ -------------------------------------------------------------------------------------------------------------------------- 
  Line   Propel/Generator/Behavior/Archivable/ArchivableBehavior.php                                                               
 ------ -------------------------------------------------------------------------------------------------------------------------- 
  69     Call to function property_exists() with Propel\Generator\Model\Table and 'isArchiveTable' will always evaluate to false.  
 ------ -------------------------------------------------------------------------------------------------------------------------- 

 ------ -------------------------------------------------------------------------------------------------------------------------------------------------------- 
  Line   Propel/Generator/Behavior/ConcreteInheritance/ConcreteInheritanceBehavior.php                                                                           
 ------ -------------------------------------------------------------------------------------------------------------------------------------------------------- 
  90     Ignored error pattern #^Access to an undefined property Propel\\Generator\\Model\\ForeignKey\:\:\$isParentChild\.$# in path                             
         /work/git/Propel2/src/Propel/Generator/Behavior/ConcreteInheritance/ConcreteInheritanceBehavior.php is expected to occur 1 time, but occurred 2 times.  
  389    Access to an undefined property Propel\Generator\Model\ForeignKey::$isParentChild.                                                                      
 ------ -------------------------------------------------------------------------------------------------------------------------------------------------------- 

 ------ -------------------------------------------------------------------------------------------------------------------------- 
  Line   Propel/Generator/Behavior/Versionable/VersionableBehavior.php                                                             
 ------ -------------------------------------------------------------------------------------------------------------------------- 
  70     Call to function property_exists() with Propel\Generator\Model\Table and 'isVersionTable' will always evaluate to false.  
 ------ -------------------------------------------------------------------------------------------------------------------------- 

                                                                                                                        
 [ERROR] Found 4 errors                                                                                                                                                                                                                      

[codecov-commenter]

Codecov Report

Base: 88.29% // Head: 88.29% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (23232e0) compared to base (e220b28).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1938      +/-   ##
============================================
- Coverage     88.29%   88.29%   -0.01%     
- Complexity     7951     7952       +1     
============================================
  Files           242      242              
  Lines         24209    24211       +2     
============================================
+ Hits          21375    21376       +1     
- Misses         2834     2835       +1     

Flag	Coverage Δ
5-max	88.29% <80.00%> (-0.01%)	⬇️
7.4	88.29% <80.00%> (-0.01%)	⬇️
agnostic	67.60% <60.00%> (-0.01%)	⬇️
mysql	68.99% <80.00%> (-0.01%)	⬇️
pgsql	68.99% <80.00%> (-0.01%)	⬇️
sqlite	66.95% <80.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Propel/Common/Config/Loader/FileLoader.php	97.89% <ø> (ø)
src/Propel/Runtime/Util/PropelDateTime.php	95.45% <66.66%> (-2.17%)	⬇️
src/Propel/Runtime/Util/UuidConverter.php	77.77% <100.00%> (ø)
.../Runtime/Validator/Constraints/UniqueValidator.php	92.85% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.