fix: fetch git tags in cibuildwheel for setuptools_scm version detection

cibuildwheel creates isolated build environments where git tags from the
outer checkout are not available. This caused setuptools_scm to fall back
to v0.5.1 instead of detecting v0.6.0.

Solution: Add 'git fetch --force --tags' to the before-build step in
cibuildwheel configuration. This ensures setuptools_scm can properly
detect the version from git tags inside each build environment.

The '|| true' ensures builds still work from source tarballs where git
is not available.

Fixes PyPI upload failures due to incorrect version numbers in wheel filenames.

Author: rappdw

pyproject.toml

@@ -84,6 +84,10 @@ build = "cp310-* cp311-* cp312-*"
 # Skip PyPy, musllinux, and 32-bit builds
 skip = "pp* *-musllinux_* *-win32 *-manylinux_i686"
 
+# Fetch tags for setuptools_scm version detection
+# The || true ensures build continues even if git fetch fails (e.g., in source tarball builds)
+before-build = "git fetch --force --tags || true"
+
 # Test that the wheel can be imported successfully
 test-command = "python -c \"import redblackgraph; print('✓ Import successful, version:', redblackgraph.__version__)\""