Upgrade actions/upload-pages-artifact: v1→v3

```
Error: This request has been automatically failed because it uses a deprecated version of `actions/upload-artifact: v3`. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/
```

.github/workflows/docs.yml

@@ -2,7 +2,7 @@ name: docs
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   workflow_dispatch:
 
 permissions:
@@ -15,15 +15,15 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: "3.10"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           pip install -r requirements.txt
       - name: Build docs
         run: |
           make -B docs
-      - uses: actions/upload-pages-artifact@v1
+      - uses: actions/upload-pages-artifact@v3
         with:
           path: docs/