Update maven-jar-plugin and maven-compiler-plugin to fix warning
The following warning when invoking `mvn versions:display-plugin-updates` does not appear anymore:
```
[WARNING] Some problems were encountered while building the effective model for org.javassist:javassist:bundle:3.19.0-GA
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 137, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-jar-plugin is missing. @ line 160, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
```