Bump Vale version to latest for Docker images when they are next built
What does this MR do and why?
Allows us to build a Docker image with the latest Vale: https://github.com/errata-ai/vale/releases/tag/v2.22.0, for when we decide to do that.
As TWs and others upgrade their local Vale, the CI/CD pipelines can remain up to date also.
Merge request acceptance checklist
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I have evaluated the MR acceptance checklist for this merge request.