Could not find artifact org.springframework.boot:spring-boot-maven-plugin:pom:3. in central

This error message indicates that the Maven Central repository could not find the specified artifact, which is the Spring Boot Maven Plugin version 3. There could be several reasons for this, such as:

- The artifact does not exist in the repository or has been removed.
- There is an issue with your Maven settings or configuration, such as incorrect repository URL or credentials.
- There could be a network connectivity issue that prevented Maven from accessing the repository.

To resolve this issue, you can try the following steps:

- Check if the artifact exists in another repository or source, such as the Spring repository or a private repository.
- Verify your Maven settings and configuration to ensure that your repository URL and credentials are correct.
- Check your network connectivity and firewall settings to ensure that Maven can access the repository.

If none of the above steps work, you may need to use an alternate version of the Spring Boot Maven Plugin or contact the repository maintainers for further assistance.