Magento 2.3.3 The “https://repo.magento.com/packages.json” file could not be downloaded:

I want to install a plugin, but the readiness check gives the next error

Check Component Dependency
We found conflicting component dependencies.

Command "require" failed:
In RemoteFilesystem.php line 559:

The "https://repo.magento.com/packages.json" file could not be downloaded:
SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify
failed
Failed to enable crypto
failed to open stream: operation failed


require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>...]

I’m using Magento 2.3.3.

Has someone a solution?