Draft: Update gluon Docker tag to v0.5.16

This MR contains the following updates:

Package	Update	Change
gluon	patch	0.5.15 -> 0.5.16

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Complete MR checklist

Assignee

• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

Add supporting info below

chuka@DESKTOP-006TSPC:~/bigbang/bigbang$ kubectl get pods -n confluence
NAME           READY   STATUS    RESTARTS   AGE
confluence-0   2/2     Running   0          32m

chuka@DESKTOP-006TSPC:~/bigbang/bigbang$ kubectl describe pod confluence-0 -n confluence
Name:             confluence-0
Namespace:        confluence
Priority:         0
Service Account:  confluence
Node:             k3d-k3s-default-server-0/172.20.0.2
Start Time:       Wed, 14 May 2025 07:46:34 -0500
Labels:           app.kubernetes.io/instance=confluence
                  app.kubernetes.io/managed-by=Helm
                  app.kubernetes.io/name=confluence
                  app.kubernetes.io/version=9.2.3
                  apps.kubernetes.io/pod-index=0
                  controller-revision-hash=confluence-76c545d8c6
                  helm.sh/chart=confluence-2.0.0-bb.0_ab68088bc3e6
                  security.istio.io/tlsMode=istio
                  service.istio.io/canonical-name=confluence
                  service.istio.io/canonical-revision=9.2.3
                  statefulset.kubernetes.io/pod-name=confluence-0
Annotations:      checksum/config-jvm: 75e30efcc351f73b4245aa4e4a961b5e88b44eb507777b39d7d9e1777d5af620
                  istio.io/rev: default
                  kubectl.kubernetes.io/default-container: confluence
                  kubectl.kubernetes.io/default-logs-container: confluence
                  prometheus.io/path: /stats/prometheus
                  prometheus.io/port: 15020
                  prometheus.io/scrape: true
                  sidecar.istio.io/status:
                    {"initContainers":["istio-init","istio-proxy"],"containers":null,"volumes":["workload-socket","credential-socket","workload-certs","istio-...
Status:           Running

Reviewer only

• Tested and Validated changes

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Upgrade Notices

N/A