Run 8.3 in CI

This is nightly 8.3 for now, but this should upgrade to production 8.3
when it's ready.

Author: NattyNarwhal

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
   ubuntu:
     strategy:
       matrix:
-          version: ['7.3', '7.4', '8.0', '8.1', '8.2']
+          version: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
     runs-on: ubuntu-latest
     services:
       ibm_db2: