Planning to update golang-github-jackc-pgx to v4

[Pirate Praveen <praveen@onenetbeyond.org>]

Hi,

I'm planning to update golang-github-jackc-pgx to 4.15. I don't see any 
reverse build dependencies so hopefully this is fine. Just asking here 
in case someone wants to keep the older version as separate binary 
package.

Since the import path has changed I think the binary package will have 
to be renamed to golang-github-jackc-pgx-v4-dev. Let me know if I 
should keep the old binary name.

Thanks
Praveen