ci: update actions versions

.github/workflows/main.yml

@@ -35,11 +35,11 @@ jobs:
     # ugh https://github.com/actions/toolkit/blob/main/docs/commands.md#path-manipulation
     - run: echo "$HOME/.local/bin" >> $GITHUB_PATH
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: recursive
         fetch-depth: 0  # nicer to have all git history when debugging/for tests
@@ -51,7 +51,7 @@ jobs:
     - run: bash .ci/run
 
     - if: matrix.platform == 'ubuntu-latest'  # no need to compute coverage for other platforms
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: .coverage.mypy_${{ matrix.platform }}_${{ matrix.python-version }}
         path: .coverage.mypy/
@@ -65,11 +65,11 @@ jobs:
     # ugh https://github.com/actions/toolkit/blob/main/docs/commands.md#path-manipulation
     - run: echo "$HOME/.local/bin" >> $GITHUB_PATH
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: '3.8'
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: recursive