Bug fixes and improvements

[ekmst]

Hello!

• Type: bug fix | code quality
• Link to issue:

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• I have created a PR for the documentation about this change

Small description of change:
bug fixes and improvements on validators

Thanks

[codecov]

Codecov Report

Merging #14208 into 4.0.x will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.0.x   #14208      +/-   ##
==========================================
- Coverage   66.31%    66.3%   -0.01%     
==========================================
  Files         475      475              
  Lines      111700   111746      +46     
==========================================
+ Hits        74078    74098      +20     
- Misses      37622    37648      +26

Impacted Files	Coverage Δ
...xt/phalcon/validation/validator/stringlength.zep.c	52.65% <0%> (+0.41%)	⬆️
ext/phalcon/validation/validator/file.zep.c	28.53% <0%> (+0.99%)	⬆️

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[niden]

Thank you @ekmst