Fixed Form::getValue() calling getAttributes() when an element is named "attributes"

[zsilbi]

Hello!

• Type: bug fix
• Link to issue: [NFR] Forms should also have attributes #13646

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 have updated the relevant CHANGELOG

Small description of change:

The getAttributes() method was added to Phalcon\Form\Form, but it wasn't added to the internal methods array.
Phalcon\Form\Form::getValue('attributes') returns the attributes from Phalcon\Form\Form::getAttributes() instead of the value of the Element, named attributes.

Thanks,
zsilbi

[codecov]

Codecov Report

Merging #14226 into 4.0.x will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.0.x   #14226      +/-   ##
==========================================
+ Coverage   66.31%   66.31%   +<.01%     
==========================================
  Files         475      475              
  Lines      111596   111597       +1     
==========================================
+ Hits        74004    74005       +1     
  Misses      37592    37592

Impacted Files	Coverage Δ
ext/phalcon/forms/form.zep.c	73% <0%> (+0.02%)	⬆️

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[niden]

Thank you @zsilbi