Fix failure of build-deploy-backup-dev.yml (#2596)

* Go to supported version (https://www.postgresql.org/support/versioning/)

* No longer used, see #2444

* Eliminate obsolete reference

.github/workflows/build-pr.yml

@@ -4,7 +4,6 @@ on:
   push:
     paths-ignore: # do NOT trigger on changes to backup service.
     - prime-database-backup/**
-    - .github/workflows/build-deploy-backup-dev.yml
     branches-ignore:
     - 'develop'
     - 'test'
@@ -13,7 +12,6 @@ on:
   pull_request:
     paths-ignore:
     - prime-database-backup/**
-    - .github/workflows/build-deploy-backup-dev.yml
     branches-ignore:
     - 'develop'
     - 'test'

prime-database-backup/openshift.dockerfile

@@ -1,4 +1,4 @@
-FROM postgres:12.4
+FROM postgres:12.20
 USER 0
 ARG PGPASSWORD
 ARG PGDATABASE