chore(deps): update alpine docker tag to v3.18.5 in dockerfile (#4008)

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

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 # what distro is the image being built for
-ARG ALPINE_TAG=3.18.4
+ARG ALPINE_TAG=3.18.5
 ARG DEBIAN_TAG=12.2-slim
 
 ARG DEFAULT_TERRAFORM_VERSION=1.6.3