Update dependencies.
Update dependencies.

- Bump junit from 4.13 to 4.13.1 #50.
- Bump biz.aQute.bndlib from 5.1.2 to 5.2.0 #51.
- Bump spotbugs from 4.1.3 to 4.1.4 #52.
- Bump spotbugs-maven-plugin from 4.1.3 to 4.1.4 #53.

apache/commons-pool,apache/commons-pool,apache/commons-pool