Update grafana/promtail Docker tag to v3

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

manifests/link/link.yaml

@@ -35,6 +35,8 @@ data:
     cnsmunich-feedback: https://yay-or-nay.cluster.fun/feedback/20UETBI0
     containerdays25: https://speaking.marcusnoble.co.uk/HARSlE/the-future-of-kubernetes-admission-logic
     containerdays25-feedback: https://yay-or-nay.cluster.fun/feedback/F8P351QK
+    cdl-2026: https://speaking.marcusnoble.co.uk/lMcEwR/pod-deep-dive-the-interesting-bits
+    cdl-2026-feedback: https://yay-or-nay.cluster.fun/feedback/EMLARINI
 ---
 apiVersion: v1
 kind: Service

manifests/monitoring/promtail.yaml

@@ -216,7 +216,7 @@ spec:
       serviceAccountName: promtail
       containers:
         - name: promtail
-          image: "grafana/promtail:2.9.17"
+          image: "grafana/promtail:3.6.2"
           imagePullPolicy: IfNotPresent
           args:
             - "-config.file=/etc/promtail/promtail.yaml"