Update dependency phpstan/phpstan-doctrine to v1.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpstan/phpstan-doctrine	1.5.5 -> 1.5.6

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Release Notes

phpstan/phpstan-doctrine (phpstan/phpstan-doctrine)

v1.5.6

Compare Source

• 8ba0228 - Add api annotation

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.98%. Comparing base (b3cfc78) to head (b2f2242).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #919   +/-   ##
=========================================
  Coverage     99.98%   99.98%           
  Complexity     3116     3116           
=========================================
  Files           533      533           
  Lines          9214     9214           
=========================================
  Hits           9213     9213           
  Misses            1        1           

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