Revert version format change

[dmikusa]

Summary

Reverts version format change introduced with a0c5b6f.

We can't make that change at this time as it impacts other buildpacks.

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[dmikusa]

@garethjevans - Sorry. I didn't have enough 🍵 this morning when I was reviewing your PR. We can't change this line as it will impact other buildpacks. Your original comment was spot on. As I mentioned, there are assumptions about versions looking a particular way in our pipelines. I'd love to get rid of those, but it's a larger effort so I can't do that now.

I'm reverting this change back.

I suspect that it'll still be OK with Tomee, but probably just not ideal. The code will strip off the milestone marker, so you'll get 10.0.5 instead of 10.0.5-M1. Not great, but if Tomee is similar to Tomcat in version numbers, there will never be both a 10.0.5 and a 10.0.5-M1 so it's still specific enough.

Let me know if you're seeing some other problem caused by this though and we can chat more.