How to fix «<…> requires composer-plugin-api >=1.1.0 <2.3.0 -> found composer-plugin-api[2.3.0] but it does not match the constraint» for Composer 2?

Administration
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1

Add the --ignore-platform-req=composer-plugin-api flag to your Composer command, e.g.:

composer require magepal/magento2-gmailsmtpapp:* --ignore-platform-req=composer-plugin-api