chore(deps): update ghcr.io/containerbase/base docker tag to v13.0.21 (…

…#2350)

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

Dockerfile

@@ -3,7 +3,7 @@ ARG RENOVATE_VERSION=39.20.1
 
 # Base image
 #============
-FROM ghcr.io/containerbase/base:13.0.20@sha256:50ec77fcca858e7a706e99ea64185fb357505e3614fed09c68b3c347bbeba7f5 AS base
+FROM ghcr.io/containerbase/base:13.0.21@sha256:8cec719c080fca375692439d7ac459a18fba433f65a0346edbaaec5bc50e1c0f AS base
 
 LABEL maintainer="Michael Kriese <[email protected]>"
 LABEL name="renovate"