[tempo-distributed] update memcached image to 1.6.39, memcached-exporter to 0.15.3#3896

fabian-woelk-el wants to merge 3 commits intografana:maingrafana/helm-charts:mainfrom

fabian-woelk-el:chore/tempo-helm/memcached-v1639fabian-woelk-el/grafana-helm-charts:chore/tempo-helm/memcached-v1639Copy head branch name to clipboard