Fix: Drop support for composer/composer:^1.0.0

[localheinz]

This pull request

• drops support for composer/composer:^1.0.0

[codecov]

Codecov Report

Merging #807 (74bdd25) into main (13f1aca) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #807   +/-   ##
=========================================
  Coverage     83.96%   83.96%           
  Complexity       57       57           
=========================================
  Files             4        4           
  Lines           237      237           
=========================================
  Hits            199      199           
  Misses           38       38           

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[localheinz]

@szepeviktor

Shouldn't be a problem - when running

composer self-update --1

followed by

composer require --dev ergebnis/composer-normalize

then ergebnis/composer-normalize:^2.15.0 will be installed.

By the way, composer also emits a warning, suggesting to upgrade to composer/composer:^2.0.0:

Warning from https://repo.packagist.org: Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer 2. See https://blog.packagist.com/deprecating-composer-1-support/