calver detection fails on -v prefixes when using non-normalized versions

[RonnyPfannschmidt]

.../setuptools_scm/version.py:396: UserWarning: <ScmVersion v23.08.08.0 dist=2 node=... dirty=True branch=use-node-date-version-for-calver> does not correspond to a valid versioning date, assuming legacy version

happens when trying to use non-normalized versions for calver

[RonnyPfannschmidt]

a workaund is tag_regex = "^(?:[\\w-]+-)?[vV]?(?P<version>\\d+(?:\\.\\d+){0,2}[^\\+]*)(?:\\+.*)?$"