Install current packaging before build

This ensures that we install the dependencies of current working branch
of `packaging`.
Similar to previous commit. `build` package depends on `packaging` and
installing it overrides the dependencies of current working branch by
the dependencies of latest `packaging` release.

.github/workflows/lint.yml

@@ -49,6 +49,9 @@ jobs:
       - name: Install dependencies
         run: python -m pip install --upgrade build
 
+      - name: Install package and dependencies
+        run: python -m pip install -e .
+
       - name: Build
         run: python -m build