Update GH Actions

- Updates the action to install Python dev dependencies and running the
  Python tests.
- Modifies steps to group JavaScript and Python steps together.

Author: perovskite

.github/workflows/ipywidgets-bokeh-ci.yml

@@ -31,13 +31,13 @@ jobs:
         run: |
           npm install --location=global npm
 
-      - name: Install dependencies
+      - name: Install JavaScript dependencies
         working-directory: ./ipywidgets_bokeh
         shell: bash
         run: |
           npm ci --no-progress
 
-      - name: Build ipywidgets-bokeh
+      - name: Build ipywidgets-bokeh JavaScript
         working-directory: ./ipywidgets_bokeh
         shell: bash
         run: |
@@ -50,19 +50,25 @@ jobs:
         run: |
           npm run test
 
-      - name: Run Playwright & Python tests
+      - name: Lint the JavaScript codebase
         if: success() || failure()
         working-directory: ./ipywidgets_bokeh
         shell: bash
         run: |
-          pytest
+          npm run lint
 
-      - name: Lint codebase
+      - name: Install dev Python dependencies
         if: success() || failure()
-        working-directory: ./ipywidgets_bokeh
         shell: bash
         run: |
-          npm run lint
+          python -m pip install --upgrade pip
+          python -m pip install --editable .[dev]
+
+      - name: Run Playwright & Python tests
+        if: success() || failure()
+        shell: bash
+        run: |
+          pytest
 
       - name: Check repository status
         if: success() || failure()