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 #776 (78c7552) into main (304c947) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #776   +/-   ##
=========================================
  Coverage     83.96%   83.96%           
  Complexity       57       57           
=========================================
  Files             4        4           
  Lines           237      237           
=========================================
  Hits            199      199           
  Misses           38       38           

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