Install Postgres 16 when testing postgres.

.github/workflows/budibase_ci.yml

@@ -200,6 +200,14 @@ jobs:
 
       - run: yarn --frozen-lockfile
 
+      - name: Set up PostgreSQL 16
+        if: matrix.datasource == 'postgres'
+        run: |
+          sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
+          wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
+          sudo apt-get update
+          sudo apt-get install -y postgresql-16
+
       - name: Test server
         env:
           DATASOURCE: ${{ matrix.datasource }}