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

tomllib is only available in Python 3.11+, but the release workflow
runs on Python 3.10. Replace with grep/sed which works everywhere.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: yusufkaraaslan

.github/workflows/release.yml

@@ -53,7 +53,7 @@ jobs:
       run: |
         TAG_VERSION="${{ steps.get_version.outputs.VERSION }}"
         PKG_VERSION=$(python -c "import skill_seekers; print(skill_seekers.__version__)")
-        TOML_VERSION=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project']['version'])")
+        TOML_VERSION=$(grep -m1 '^version' pyproject.toml | sed 's/version *= *"\(.*\)"/\1/')
         echo "Tag version:     $TAG_VERSION"
         echo "Package version: $PKG_VERSION"
         echo "TOML version:    $TOML_VERSION"