[CI] Bump actions to v4

.github/workflows/build_wheels.yml

@@ -22,7 +22,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build wheels
         uses: pypa/[email protected]
@@ -31,7 +31,7 @@ jobs:
         #   CIBW_SOME_OPTION: value
         env:
           # List of platforms to build on
-          CIBW_BUILD: cp3{8,9,10,11}-manylinux_x86_64 cp3{8,9,10,11}-macosx_x86_64 cp3{8,9,10,11}-macosx_arm64 cp3{8,9,10,11}-win_amd64
+          CIBW_BUILD: cp3{8,9,10,11,12}-manylinux_x86_64 cp3{8,9,10,11,12}-macosx_x86_64 cp3{8,9,10,11,12}-macosx_arm64 cp3{8,9,10,11,12}-win_amd64
 
           # Install Eigen and pybind11 on manylinux images (no brew, need Eigen >= 3.4)
           CIBW_BEFORE_ALL_LINUX: >
@@ -62,21 +62,23 @@ jobs:
           CIBW_TEST_REQUIRES: numpy
           CIBW_TEST_COMMAND: python {project}/tests/test_multistart.py
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
+          name: cibw-wheels-${{ matrix.os }}-${{ strategy.job-index }}
           path: ./wheelhouse/*.whl
 
   build_sdist:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build sdist
         run: pipx run build --sdist
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
+          name: cibw-sdist
           path: dist/*.tar.gz
 
   upload_pypi:
@@ -89,8 +91,10 @@ jobs:
     steps:
       - uses: actions/download-artifact@v4
         with:
-          name: artifact
+          # unpacks all CIBW artifacts into dist/
+          pattern: cibw-*
           path: dist
+          merge-multiple: true
 
       - uses: pypa/[email protected]
         with:

.github/workflows/test.yml

@@ -13,12 +13,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8","3.9","3.10","3.11"]
+        python-version: ["3.8","3.9","3.10","3.11","3.12"]
 
     steps:
-    - uses: actions/checkout@v3
+    - 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 }}
     - name: Install dependencies