chore(deps): update container image memcached to v12.9.12@865bf31 by renovate (#21133)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [memcached](https://truecharts.org/charts/stable/memcached)
([source](https://togithub.com/bitnami/bitnami-docker-memcached)) |
patch | `12.9.7` -> `12.9.12` |

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charts/stable/gitea/Chart.yaml

@@ -17,7 +17,7 @@ dependencies:
     tags: []
     import-values: []
   - name: memcached
-    version: 12.9.7
+    version: 12.9.12
     repository: oci://tccr.io/truecharts
     condition: memcached.enabled
     alias: ""
@@ -46,4 +46,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/gitea
   - https://hub.docker.com/r/gitea/gitea
 type: application
-version: 18.16.20
+version: 18.16.21