fix(release): drop stale src pathspec from version commit

src/ held the Docusaurus React homepage and went away with the Zensical
migration; the package itself lives in confluence_markdown_exporter/. Passing a
pathspec that matches no tracked files makes git add -u exit 128, which killed
the 5.4.0 release run right after the docs bump.

Author: Sebastian Penhouet

.github/workflows/release.yml

@@ -75,7 +75,7 @@ jobs:
           git config --local user.email "action@github.com"
           git config --local user.name "GitHub Action"
           # -u: stage modifications to tracked files only; never add untracked files.
-          git add -u pyproject.toml uv.lock README.md docs src
+          git add -u pyproject.toml uv.lock README.md docs
           git diff --cached --quiet || git commit -m "Bump version to ${{ env.NEW_VERSION }}"
           git push