ci(release): include version key post-modification

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Add unique post-release segment to publish to TestPyPI
         if: "!startsWith(github.ref, 'refs/tags/')" # only modify version when publishing to TestPyPI
-        run: sed -i "s/^__version__ = \"\([0-9]\+\.[0-9]\+\.[0-9]\+\)\"$/\1.post$(date +%s)/" ibis_ml/__init__.py
+        run: sed -i "s/^\(__version__ = \"[0-9]\+\.[0-9]\+\.[0-9]\+\)\"$/\1.post$(date +%s)\"/" ibis_ml/__init__.py
       - name: Set up Python
         uses: actions/setup-python@v4
         with: