Add v-prefixed tags for releases

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Releases are named with a "v" prefix e.g. "v2.2.2" but the underlying Git tag does not have it. It's common for the tag itself to match and makes references in Actions, dependency update tools, etc. to be more consistent with other projects.

Requesting the creation of new tags for the past releases or at least the latest, and to use that pattern going forward (or both).