ci: restrict typing_extensions version macos tests

Otherwise we get a typing_extensions version that is too new (support for Python 3.7 was dropped in https://github.com/python/typing_extensions/releases/tag/4.8.0), resulting in a SyntaxError from typing_extensions' `TypedDict`.

.github/workflows/ci_tests.yml

@@ -3,9 +3,9 @@ name: CI Tests
 on:
   push:
     branches:
-    - main
+      - main
     tags:
-    - '*'
+      - "*"
   pull_request:
 
 jobs:
@@ -17,13 +17,13 @@ jobs:
       - name: Install node
         uses: actions/setup-node@v2
         with:
-          node-version: '18.x'
-          registry-url: 'https://registry.npmjs.org'
+          node-version: "18.x"
+          registry-url: "https://registry.npmjs.org"
 
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.x'
+          python-version: "3.x"
 
       - name: Install dependencies
         run: |
@@ -53,7 +53,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.x'
+          python-version: "3.x"
 
       - name: Install bqplot-image-gl and jupyterlab
         run: |
@@ -93,10 +93,12 @@ jobs:
         - linux: py38-test
 
         - macos: py37-test
+          toxdeps: "typing_extensions<4.8"
         - macos: py310-test
 
         - windows: py39-test
 
         - linux: py38-notebooks
         - macos: py37-notebooks
+          toxdeps: "typing_extensions<4.8"
         - windows: py39-notebooks