[Maint] Update workflow actions for node 20 (#210)

This PR updates workflow actions for node 20 (there's been warnings).
The codecov change is based on
napari/napari#6701
This uses the napari organization github secret

.github/workflows/deploy_docs.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Clone repo
       uses: actions/checkout@v4
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: "3.10"
 

.github/workflows/test_and_deploy.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python 3.8
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Install dependencies
@@ -50,7 +50,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -71,14 +71,16 @@ jobs:
 
       # this runs the platform-specific tests declared in tox.ini
       - name: Test with tox
-        uses: aganders3/headless-gui@v1
+        uses: aganders3/headless-gui@v2
         with:
             run: tox
         env:
           PLATFORM: ${{ matrix.platform }}
 
       - name: Coverage
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   deploy:
     # this will run when you have tagged a commit, starting with "v*"