here the console output :
root@d4e1c93169c1:/var/www/html# composer require koco/mautic-recaptcha-bundle:3.*
The "ocramius/package-versions" plugin was skipped because it requires a Plugin API version ("^1.0.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.
The "robloach/component-installer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.
./composer.json has been created
The "ocramius/package-versions" plugin was skipped because it requires a Plugin API version ("^1.0.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.
The "robloach/component-installer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.
Running composer update koco/mautic-recaptcha-bundle
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

Problem 1
- koco/mautic-recaptcha-bundle[3.0.0, ..., 3.0.1] require mautic/composer-plugin ^1.0 -> satisfiable by mautic/composer-plugin[1.0.0, 1.0.1].
- mautic/composer-plugin[1.0.0, ..., 1.0.1] require composer-plugin-api ^1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
- Root composer.json requires koco/mautic-recaptcha-bundle 3.* -> satisfiable by koco/mautic-recaptcha-bundle[3.0.0, 3.0.1].

You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.

Installation failed, deleting ./composer.json.