fix(deps): update ghcr.io/containerbase/base docker tag to v14.6.21 (#1661)

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

Author: renovate[bot]

Dockerfile

@@ -1,7 +1,7 @@
 # renovate: datasource=node-version depName=node versioning=node
 ARG NODE_VERSION=24.14.1
 
-FROM ghcr.io/containerbase/base:14.6.20@sha256:d81e298a1d585c636ac609cbba6182537915b02545f60482f431d22e16609355
+FROM ghcr.io/containerbase/base:14.6.21@sha256:994ad45621589b8a96711db8a5dcaddae8d0d17931780c99bcdf65ba16dbe443
 
 ARG NODE_VERSION