chore(deps): update matrix-stack docker tag to v25.12.2 (#1180)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

charts/matrix/Chart.yaml

@@ -1,11 +1,11 @@
 apiVersion: v2
 name: matrix
 description: A Matrix Helm chart for Kubernetes using ESS Community
-version: 0.1.5
+version: 0.1.6
 maintainers:
   - name: sebastian
     email: [email protected]
 dependencies:
   - name: matrix-stack
     repository: oci://ghcr.io/element-hq/ess-helm
-    version: 25.12.1
+    version: 25.12.2