chore(deps): update prom/memcached-exporter docker tag to v0.16.0

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

Author: renovate[bot]

values.yaml

@@ -1714,7 +1714,7 @@ memcached-frontend:
     enabled: true
     image:
       repository: prom/memcached-exporter
-      tag: "v0.15.5"
+      tag: "v0.16.0"
     serviceMonitor:
       enabled: false
 
@@ -1739,7 +1739,7 @@ memcached-blocks-index:
     enabled: true
     image:
       repository: prom/memcached-exporter
-      tag: "v0.15.5"
+      tag: "v0.16.0"
     serviceMonitor:
       enabled: false
 
@@ -1764,7 +1764,7 @@ memcached-blocks:
     enabled: true
     image:
       repository: prom/memcached-exporter
-      tag: "v0.15.5"
+      tag: "v0.16.0"
     serviceMonitor:
       enabled: false
 
@@ -1789,7 +1789,7 @@ memcached-blocks-metadata:
     enabled: true
     image:
       repository: prom/memcached-exporter
-      tag: "v0.15.5"
+      tag: "v0.16.0"
     serviceMonitor:
       enabled: false