BouncyCastle dependency definition has no effect

In the master branch, phoenix defines ${bouncycastle.version} and uses it to set the version of bcprov-jdk16 artidact via the DependencyManagement mechanism.

Since the splitting of phoenix-queryserver and phoenix-connector repos, bouncycastle is not used anywhere in the phoenix repo, so this these settings have no effect.

phoenix-queryserver and phoenix-connector do not declare phoenix as parent, and even if they did, they currently refer to phoenix versions where these setting were not present.

Also, the currently defined bouncycastle version is very old.

Due to these reasons, I propose removing the bouncycastle maven references from the phoenix project.