Update CI.

Author: anntzer

.github/workflows/build.yml

@@ -7,12 +7,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-11, windows-2019]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-20.04, macos-13, windows-2019]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Build & install
@@ -68,13 +68,23 @@ jobs:
           fi
         ) &&
         PYTHONFAULTHANDLER=1 PYTHONIOENCODING=utf-8 ./run-examples.py
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
-        name: wheels
-        path: dist/
+        name: wheel-${{ matrix.os }}-${{ matrix.python-version }}
+        path: dist/*.whl
       if: ${{ always() }}
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: result_images-${{ matrix.os }}-py${{ matrix.python-version }}
         path: result_images/
       if: ${{ failure() }}
+
+  merge-wheels:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+    - uses: actions/upload-artifact/merge@v4
+      with:
+        name: wheels
+        pattern: wheel-*
+        delete-merged: true