Build on container-base almalinux9 0.1.3

The 0.1.0 base shipped only the root CA in unkin-ca-certificates, so
s3.ceph.unkin.net — a bare leaf issued by the intermediate — failed to
verify and the baked-in go-cache-plugin could never reach the shared
build cache. 0.1.3 ships both anchors.

- Bump BASE_VERSION to 0.1.3.

Dockerfile

@@ -1,6 +1,6 @@
 ARG REGISTRY=artifactapi.k8s.syd1.au.unkin.net/docker-internal
 # The container-base release this image is built on — the one place to bump it.
-ARG BASE_VERSION=0.1.0
+ARG BASE_VERSION=0.1.3
 ARG BASE_IMAGE_NAME=almalinux9
 
 FROM ${REGISTRY}/${BASE_IMAGE_NAME}:${BASE_VERSION} AS image