Update GitHub actions' versions (#424)

* cache@v2 is EOL, change to cache@v4

* upload-artifact@v3 is deprecated, use v4 with breaking changes

* download-artifact@v3 to v4 with multiple artifacts due to upload@v4

* update setup-python version to v4

.github/workflows/cpp.yml

@@ -40,7 +40,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.apt/cache
           key: ${{ runner.os }}-apt-${{ hashFiles('**/ubuntu_dependencies.yml') }}

.github/workflows/pypi.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Move sdist to dist
         run: mkdir -p dist && mv ${{github.workspace}}/python/dist/*.tar.gz dist/
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz
 
@@ -47,19 +47,21 @@ jobs:
         with:
           package-dir: ${{github.workspace}}/python/
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
+          name: artifact-${{ matrix.os }}
           path: ./wheelhouse/*.whl
 
   pypi:
     if: github.event_name == 'release'
     needs: [cibuildwheel, build_sdist]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: artifact
+          pattern: artifact*
           path: dist
+          merge-multiple: true
 
       - uses: pypa/gh-action-pypi-publish@release/v1
         with:

.github/workflows/python.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python3
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip