PHP Fatal Error [#3311309]

Problem/Motivation

> PHP Fatal error:  Declaration of Drupal\social_auth_keycloak\Plugin\Network\KeycloakAuth::validateConfig(Drupal\social_auth\Settings\SettingsBase $settings): bool must be compatible with Drupal\social_auth\Plugin\Network\NetworkBase::validateConfig(Drupal\social_auth\Settings\SettingsInterface $settings): bool in /var/www/html/web/modules/contrib/social_auth_keycloak/src/Plugin/Network/KeycloakAuth.php on line 98

Steps to reproduce

Clear drupal caches after getting the latest version.

Proposed resolution

Use the right type.

Remaining tasks

Patch or MR.

User interface changes

API changes

Data model changes

Issue fork social_auth_keycloak-3311309

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3311309-php-fatal-error changes, plain diff MR !1
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