Bump setup.py __version__ to 1.12.1 so cache invalidation finally fires

setup.py has been pinned at __version__ = "1.8.0" since the 1.8 line,
so importlib.metadata.version('vfbquery') returns "1.8.0" inside every
running worker no matter which git tag (or Docker tag) ships the wheel.

solr_result_cache.py:251-258 checks
  current_version = _normalize_version(_get_package_version())
  cached_version  = _normalize_version(cached.get("package_version")
                                       or cached.get("version"))
  if current_version and cached_version != current_version: invalidate
With both sides reduced to "1.8" (major.minor), every cached entry is
considered current and never invalidates — even after upgrading from
v1.10.1 -> v1.11.0 -> v1.12.0. That is why SimilarMorphologyTo,
PaintedDomains, NeuronsPresynapticHere, LineageClonesIn,
TractsNervesInnervatingHere etc still return v1.10.x-era shapes on the
live API despite all four workers showing image tag v1.12.0 in Rancher.

Bumping __version__ to 1.12.1 normalizes to "1.12" — old "1.8" entries
mismatch and self-invalidate on next read.

Future-proof: derive __version__ from the git tag (setuptools-scm or
similar) so this can't drift again. Deferred to a follow-up.

Author: Robbie1977

setup.py

@@ -3,7 +3,7 @@
 
 here = path.abspath(path.dirname(__file__))
 
-__version__ = "1.8.0"
+__version__ = "1.12.1"
 
 # Get the long description from the README file
 with open(path.join(here, 'README.md')) as f: