Enhancement: Restore auto-merge of dependabot pull requests

[localheinz]

This pull request

• restores the auto-merge of dependabot pull requests

Follows ergebnis/php-package-template#759.

[codecov]

Codecov Report

Merging #359 (4e696c0) into main (11f8bd3) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #359   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         5         5           
===========================================
  Files              2         2           
  Lines             12        12           
===========================================
  Hits              12        12           

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