Fix: Add note about allow-plugins configuration option for composer/composer

[localheinz]

This pull request

• adds a note about the newly-added allow-plugins configuration option for composer/composer

[codecov]

Codecov Report

Merging #834 (b414190) into main (8875520) will not change coverage.
The diff coverage is n/a.

❗ Current head b414190 differs from pull request most recent head 7f1e211. Consider uploading reports for the commit 7f1e211 to get more accurate results

@@            Coverage Diff            @@
##               main     #834   +/-   ##
=========================================
  Coverage     84.04%   84.04%           
  Complexity       59       59           
=========================================
  Files             4        4           
  Lines           282      282           
=========================================
  Hits            237      237           
  Misses           45       45           

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