chore: install 'build' dependency for the release GHA workflow

.github/workflows/publish.yaml

@@ -15,6 +15,7 @@ jobs:
           python-version: '3.x'
           cache: pip
       - run: pip install -e .
+      - run: pip install build
       # Use the commit date instead of the current date during the build.
       - run: echo "SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)" >> $GITHUB_ENV
       - run: python -m build