fix: use new 16 postgres containers (#204)

## Description

We need to use the new postgres containers

---

## Checklist

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- [ ] Update
[CHANGELOG.md](https://github.com/sourcegraph/deploy-sourcegraph-k8s/blob/main/CHANGELOG.md)
- [ ] Update [K8s Upgrade
notes](https://github.com/sourcegraph/sourcegraph/blob/main/doc/admin/updates/kubernetes.md)
- [ ] Kustomiz-specific changes
- [x] Update sister repository:
[deploy-sourcegraph-helm](https://github.com/sourcegraph/deploy-sourcegraph-helm)
- [x] Update sister repository:
[deploy-sourcegraph-docker](https://github.com/sourcegraph/deploy-sourcegraph-docker)
- [ ] Verify all images have a valid tag and SHA256 sum

## Test plan
CI
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---------

Co-authored-by: Jacob Pleiness <[email protected]>

Author: Chickensoupwithrice

base/sourcegraph/codeinsights-db/codeinsights-db.StatefulSet.yaml

@@ -45,7 +45,7 @@ spec:
             runAsUser: 70
       containers:
         - name: codeinsights
-          image: index.docker.io/sourcegraph/codeinsights-db:5.9.1590@sha256:4e75b2c463ce1ef3bfeec4bb71a16693df02005e66b9e697859ce61064e08f42
+          image: index.docker.io/sourcegraph/postgresql-16-codeinsights:insiders
           env:
             - name: POSTGRES_DB
               value: postgres

base/sourcegraph/codeintel-db/codeintel-db.StatefulSet.yaml

@@ -45,7 +45,7 @@ spec:
               memory: "50Mi"
       containers:
         - name: pgsql
-          image: index.docker.io/sourcegraph/codeintel-db:5.9.1590@sha256:3d5dd36e3af6b643903f507422be19ed1cb1f5f71c4541572d4a8a252e81aeb8
+          image: index.docker.io/sourcegraph/postgresql-16:insiders
           terminationMessagePolicy: FallbackToLogsOnError
           readinessProbe:
             exec:

base/sourcegraph/pgsql/pgsql.StatefulSet.yaml

@@ -46,7 +46,7 @@ spec:
               memory: "50Mi"
       containers:
         - name: pgsql
-          image: index.docker.io/sourcegraph/postgres-12-alpine:5.9.1590@sha256:3d5dd36e3af6b643903f507422be19ed1cb1f5f71c4541572d4a8a252e81aeb8
+          image: index.docker.io/sourcegraph/postgresql-16:insiders
           terminationMessagePolicy: FallbackToLogsOnError
           readinessProbe:
             exec: