Fix phpstan-type declarations

[staabm]

the syntax does not have a =

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.80%. Comparing base (48b98da) to head (fc41dd1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1051   +/-   ##
=========================================
  Coverage     85.80%   85.80%           
  Complexity     1360     1360           
=========================================
  Files            90       90           
  Lines          4671     4671           
=========================================
  Hits           4008     4008           
  Misses          663      663           

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[staabm]

now tested locally. it does not fix the issue, but still is a required change IMO

[sebastianbergmann]

Thank you!