T14293 application interface correction

[niden]

Hello!

• Type: bug fix
• Link to issue: Return type error in Phalcon\Application\AbstractApplication #14293

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

Corrected interfaces

Thanks

[niden]

cc @sergeyklay

[codecov]

Codecov Report

Merging #14298 into 4.0.x will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            4.0.x   #14298   +/-   ##
=======================================
  Coverage    66.3%    66.3%           
=======================================
  Files         488      488           
  Lines      115910   115910           
=======================================
  Hits        76859    76859           
  Misses      39051    39051

[sergeyklay]

Well done!