deps: update postgres docker tag to v18 (GoogleCloudPlatform#3796)

* deps: update postgres docker tag to v18

* chore: also update client to v18

---------

Co-authored-by: Knut Olav Løite <[email protected]>

Author: renovate-bot

.github/workflows/integration-emulator.yaml

@@ -15,7 +15,7 @@ jobs:
     # Add a PostgreSQL Docker container and the emulator.
     services:
       postgres:
-        image: postgres:17
+        image: postgres:18
         env:
           POSTGRES_PASSWORD: postgres
         # Set health checks to wait until postgres has started
@@ -66,7 +66,7 @@ jobs:
           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 --yes --no-install-recommends postgresql-client-17
+          sudo apt-get install --yes --no-install-recommends postgresql-client-18
       - name: Create PostgreSQL test database
         run: |
           psql -h /pg -U postgres -c "CREATE DATABASE pgadapter"

.github/workflows/integration.yaml

@@ -42,7 +42,7 @@ jobs:
     services:
       # Container label
       postgres:
-        image: postgres:17
+        image: postgres:18
         env:
           POSTGRES_PASSWORD: postgres
         # Set health checks to wait until postgres has started