make org.springframework.security.oauth:spring-security-oauth2 as optional

Author: bnasslahsen

springdoc-openapi-security/src/main/java/org/springdoc/core/SpringDocSecurityConfiguration.java

@@ -26,7 +26,7 @@ IgnoredParameterTypes ignoredParameterTypes() {
 
     @Configuration
     @ConditionalOnBean(FrameworkEndpointHandlerMapping.class)
-    static class SpringSecurityOAuth2ProviderConfiguration {
+    class SpringSecurityOAuth2ProviderConfiguration {
         @Bean
         public SpringSecurityOAuth2Provider springSecurityOAuth2Provider(FrameworkEndpointHandlerMapping oauth2EndpointHandlerMapping) {
             return new SpringSecurityOAuth2Provider(oauth2EndpointHandlerMapping);