Fix: Do not let dependabot update doctrine/persistence

[localheinz]

This pull request

• configures dependabot to stop updating doctrine/persistence

[codecov]

Codecov Report

Merging #713 (1329705) into main (f64c6b8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #713   +/-   ##
=========================================
  Coverage     98.55%   98.55%           
  Complexity      105      105           
=========================================
  Files            25       25           
  Lines           345      345           
=========================================
  Hits            340      340           
  Misses            5        5           

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