Use alternative Bitnami images in our CI

Bitnami is switching to paid subscription model: https://community.broadcom.com/tanzu/blogs/beltran-rueda-borrego/2025/08/18/how-to-prepare-for-the-bitnami-changes-coming-soon

The changes will start on 28th of August and will involve periods of brownownts for certain images:

• August 28, 08:00 UTC → August 29, 08:00 UTC
• September 2, 08:00 UTC → September 3, 08:00 UTC
• September 17, 08:00 UTC → September 18, 08:00 UTC

We need to research whether there is an alternative for the images we are using, or maybe we should consider a subscription:

.gitlab/ci/integration.yml:    - name: bitnami/postgresql:${PG_VERSION}
.gitlab/ci/integration.yml:    - name: bitnami/postgresql:${PG_VERSION}
.gitlab/ci/integration.yml:    - name: bitnami/postgresql:${PG_VERSION}
.gitlab/ci/integration.yml:    - name: bitnami/redis-sentinel
.gitlab/ci/integration.yml:    - name: bitnami/redis-sentinel
.gitlab/ci/integration.yml:    - name: bitnami/redis-cluster:$REDIS_CLUSTER_VERSION
.gitlab/ci/integration.yml:    - name: bitnami/redis-cluster:$REDIS_CLUSTER_VERSION
.gitlab/ci/integration.yml:    - name: bitnami/redis-cluster:$REDIS_CLUSTER_VERSION
script/dev/docker-compose.redis-cluster.yml:    image: bitnami/redis-cluster:8.0.2
script/dev/docker-compose.redis-cluster.yml:    image: bitnami/redis-cluster:8.0.2
script/dev/docker-compose.redis-cluster.yml:    image: bitnami/redis-cluster:8.0.2

Putting it into current milestone as the issue seems urgent.