remove spring boot plugin and add this plugin.

        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.11.0</version>  <!-- Use the latest version -->
        <configuration>
            <source>21</source> 
            <target>21</target>
        </configuration>
    </plugin>