Remove generic type from OAuth2AuthorizationServerConfigurer

Remove generic type from `OAuth2AuthorizationServerConfigurer`.

Usages should be replaced as follows:

From:

```java
OAuth2AuthorizationServerConfigurer<HttpSecurity> authorizationServerConfigurer =
		new OAuth2AuthorizationServerConfigurer<>()
```

To:

```java
OAuth2AuthorizationServerConfigurer authorizationServerConfigurer =
		new OAuth2AuthorizationServerConfigurer()
```