Update some dependencies.
Update some dependencies.

- io.reactivex.rxjava2:rxjava .......................... 2.2.7 -> 2.2.21
- junit:junit ........................................... 4.13 -> 4.13.2
- net.java.dev.jna:jna .................................. 5.2.0 -> 5.9.0
- net.java.dev.jna:jna-platform ......................... 5.2.0 -> 5.9.0
- org.apache.logging.log4j:log4j-core .................. 2.9.1 -> 2.14.1
- org.apache.logging.log4j:log4j-slf4j-impl ............ 2.9.1 -> 2.14.1
- org.conscrypt:conscrypt-openjdk-uber .................. 2.2.1 -> 2.5.2
- org.ehcache.modules:ehcache-api ....................... 3.4.0 -> 3.9.6
- org.mockito:mockito-core ............................. 3.10.0 -> 4.0.0
- JApiCmp ............................................. 0.15.3 -> 0.15.4

apache/httpcomponents-client