Update Docker variable values to latest versions
What does this MR do and why?
Continuing #1609 (closed), to take advantage of fixes in markdownlint-cli2, update the versions of tooling we build Docker images from.
- https://alpinelinux.org/posts/Alpine-3.18.0-released.html
- https://github.com/errata-ai/vale/releases
- https://github.com/DavidAnson/markdownlint-cli2/tags
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