Fix: Use --generate-baseline option for generating baseline for phpstan/phpstan

[localheinz]

This pull request

• uses the --generate-baseline option for generating the baseline for phpstan/phpstan
• runs make static-code-analysis-baseline

Follows #381.

[codecov]

Codecov Report

Merging #386 (410cbb7) into main (9909693) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #386   +/-   ##
=========================================
  Coverage     90.04%   90.04%           
  Complexity      151      151           
=========================================
  Files            23       23           
  Lines           432      432           
=========================================
  Hits            389      389           
  Misses           43       43           

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