Example update

[MichalJana]

Hi, can you please update this example according to changes in SpringBoot security and deprecation of @EnableResourceServer and other methods. Thx.

[lousaibiao]

Tell me your SpringBoot security version. @MichalJana

[MichalJana]

Sorry for the late reply:

```

<groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> 2.2.6.RELEASE <groupId>org.springframework.security.oauth.boot</groupId> <artifactId>spring-security-oauth2-autoconfigure</artifactId> 2.2.6.RELEASE <groupId>org.springframework.security.oauth</groupId> <artifactId>spring-security-oauth2</artifactId> 2.4.1.RELEASE