tests: Update Postgres versions in tests

* Remove older vesions that are EOL (9, 10)
* Add 13 and 14
* Temporary remove latest as tests are failing against Postgres 15

Author: cyrilgdn

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        pgversion: ["latest", 12, 11, 10, 9]
+        pgversion: [14, 13, 12, 11]
 
     env:
       PGVERSION: ${{ matrix.pgversion }}