GEOT-4511 -- replace references to <version>X-SNAPSHOT</version> with the version supplied in the tag

Hi Andrea,

I've had a look at the build script you pointed me at and added in the one-liner I used to fix all the pom.xml files.

I think this should do what we want.  I'm not sure how I can do an end-to-end test on the script because it starts trying to checkout files from git, etc by itself and this file isn't committed yet.  If I comment out all the git actions, I can see the pom.xml files get fixed up correctly.  I tried a release tag of 9.3 and and it replaced <version>9-SNAPSHOT</version> with <version>9.3</version> as I would expect.

This probably needs futher testing before being used but should be pretty close to what's needed.

HTH...

Geoff