Update dependency prometheus-operator/kube-prometheus to v0.15.0

Author: renovate[bot]

hack/config/monitoring/update.sh

@@ -7,7 +7,7 @@ set -o pipefail
 cd "$(dirname "${BASH_SOURCE[0]}")"
 
 # renovate: datasource=github-releases depName=prometheus-operator/kube-prometheus
-KUBE_PROMETHEUS_VERSION=v0.14.0
+KUBE_PROMETHEUS_VERSION=v0.15.0
 echo "> Fetching kube-prometheus@$KUBE_PROMETHEUS_VERSION"
 
 tmp_dir=$(mktemp -d)