[prometheus-memcached-exporter] Update dependency prometheus/memcached_exporter to v0.15.3

Author: renovate[bot]

charts/prometheus-memcached-exporter/Chart.yaml

@@ -2,9 +2,9 @@ apiVersion: v2
 name: prometheus-memcached-exporter
 description: Prometheus exporter for Memcached metrics
 type: application
-version: 0.4.1
+version: 0.4.2
 # renovate: github=prometheus/memcached_exporter
-appVersion: "v0.15.0"
+appVersion: "v0.15.3"
 home: https://github.com/prometheus/memcached_exporter
 sources:
   - https://github.com/prometheus/memcached_exporter