fix: use grep instead of python import for version check in release workflow

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: callmeiks

.github/workflows/release.yml

@@ -19,11 +19,7 @@ jobs:
       - name: Verify version matches tag
         run: |
           TAG="${GITHUB_REF#refs/tags/v}"
-          PKG_VERSION=$(python -c "
-import re, pathlib
-text = pathlib.Path('src/tikhub/_version.py').read_text()
-print(re.search(r'__version__\s*=\s*[\"'\''](.*?)[\"'\'']', text).group(1))
-")
+          PKG_VERSION=$(grep -oP '__version__\s*=\s*"\K[^"]+' src/tikhub/_version.py)
           if [ "$TAG" != "$PKG_VERSION" ]; then
             echo "::error::tag $TAG does not match package version $PKG_VERSION"
             exit 1