namespace Symfony\Component\Security\Http\Authenticator\Passport\Credentials;

// ...

class PasswordCredentials implements CredentialsInterface
{
    // ...

    public function __construct(
        \[SensitiveParameter]
        string $password
    ) {
        $this->password = $password;
    }

    // ...
}

namespace Symfony\Component\HttpClient;

// ...

class HttpOptions
{
    // ...

    public function setAuthBasic(
        string $user,
        #[\SensitiveParameter]
        string $password = ''
    ): static
    {
        $this->options['auth_basic'] = $user;

        if ('' !== $password) {
            $this->options['auth_basic'] .= ':'.$password;
        }

        return $this;
    }

    // ...
}