chore(deps): update loki memcached images to v1.6.31 (#752)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[cgr.dev/du-uds-defenseunicorns/memcached](https://images.chainguard.dev/directory/image/memcached/overview)
([source](https://redirect.github.com/chainguard-images/images-private/tree/HEAD/images/memcached))
| patch | `1.6.27` -> `1.6.31` |
| docker.io/memcached | patch | `1.6.27-alpine` -> `1.6.31-alpine` |
|
[registry1.dso.mil/ironbank/opensource/memcached/memcached](https://memcached.org/)
([source](https://repo1.dso.mil/dsop/opensource/memcached/memcached)) |
patch | `1.6.27` -> `1.6.31` |

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src/loki/values/registry1-values.yaml

@@ -23,4 +23,4 @@ gateway:
 memcached:
   image:
     repository: registry1.dso.mil/ironbank/opensource/memcached/memcached
-    tag: 1.6.27
+    tag: 1.6.31

src/loki/values/unicorn-values.yaml

@@ -11,4 +11,4 @@ gateway:
 memcached:
   image:
     repository: cgr.dev/du-uds-defenseunicorns/memcached
-    tag: 1.6.27
+    tag: 1.6.31

src/loki/values/upstream-values.yaml

@@ -14,4 +14,4 @@ memcached:
   image:
     registry: docker.io
     repository: memcached
-    tag: 1.6.27-alpine
+    tag: 1.6.31-alpine

src/loki/zarf.yaml

@@ -18,7 +18,7 @@ components:
     images:
       - docker.io/grafana/loki:3.1.1
       - docker.io/nginxinc/nginx-unprivileged:1.27-alpine
-      - docker.io/memcached:1.6.27-alpine
+      - docker.io/memcached:1.6.31-alpine
 
   - name: loki
     required: true
@@ -34,7 +34,7 @@ components:
     images:
       - registry1.dso.mil/ironbank/opensource/grafana/loki:3.1.1
       - registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine:1.26.2
-      - registry1.dso.mil/ironbank/opensource/memcached/memcached:1.6.27
+      - registry1.dso.mil/ironbank/opensource/memcached/memcached:1.6.31
 
   - name: loki
     required: true
@@ -50,4 +50,4 @@ components:
     images:
       - cgr.dev/du-uds-defenseunicorns/loki:3.1.1
       - cgr.dev/du-uds-defenseunicorns/nginx-fips:1.27.1
-      - cgr.dev/du-uds-defenseunicorns/memcached:1.6.27
+      - cgr.dev/du-uds-defenseunicorns/memcached:1.6.31