Improve PHP 8.2 compatibility : Partially-supported callable are deprecated

[romaincousseau]

The propel gen command when a table in schema.xml depends on a baseClass generates code
in the "Base" namespace that is not compatible with PHP 8.2.

For example, when saving the object, a deprecation warning is displayed:
Deprecated: Use of "self" in callables is deprecated in ... on line ...

This is a known issue whith PHP8.2 :
https://php.watch/versions/8.2/partially-supported-callable-deprecation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6fd10bf) 89.28% compared to head (c6b4add) 89.28%.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1979   +/-   ##
=========================================
  Coverage     89.28%   89.28%           
  Complexity     8058     8058           
=========================================
  Files           232      232           
  Lines         24534    24534           
=========================================
  Hits          21905    21905           
  Misses         2629     2629           

Flag	Coverage Δ
5-max	89.28% <ø> (ø)
7.4	89.28% <ø> (ø)
agnostic	67.44% <ø> (ø)
mysql	69.83% <ø> (ø)
pgsql	69.87% <ø> (ø)
sqlite	67.81% <ø> (ø)

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