ci: update actions (#4464)

* ci: update actions

* ci: update actions

* ci: update actions

* ci: use py3.9 for docs

.github/workflows/projects.yml

@@ -45,7 +45,7 @@ jobs:
           submodules: "recursive"
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9
 
@@ -53,7 +53,7 @@ jobs:
         run: pip install -U .
 
       - name: Check out ${{ matrix.project.repository }}
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           submodules: "recursive"
           repository: ${{ matrix.project.repository }}