Update GitHub actions to their latest versions

This should fix deprecation warnings about Node.js 16 actions.

The behaviour of `actions/upload-artifact` has changed, we need to
use unique names for each artifact.

.github/workflows/issues.yml

@@ -7,7 +7,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v8
+      - uses: actions/stale@v9
         with:
           stale-issue-label: stale
           stale-issue-message: "This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions."

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Build documentation
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Install packages
@@ -58,7 +58,7 @@ jobs:
           - "3.8"
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
       - name: Disable firewall and configure compiler
@@ -83,24 +83,24 @@ jobs:
           coverage xml
         shell: bash
       - name: Upload coverage report
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         if: matrix.python != 'pypy3'
 
   package-source:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Build source package
         run: |
           pip install -U build
           python -m build --sdist
       - name: Upload source package
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: dist
+          name: dist-source
           path: dist/
 
   package-wheel:
@@ -125,7 +125,7 @@ jobs:
             arch: x86
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Install QEMU
@@ -146,19 +146,19 @@ jobs:
           pip install cibuildwheel
           cibuildwheel --output-dir dist
       - name: Upload wheels
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: dist
+          name: dist-wheel-${{ matrix.os }}-${{ matrix.arch }}
           path: dist/
 
   publish:
     runs-on: ubuntu-latest
     needs: [lint, test, package-source, package-wheel]
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: dist
+          merge-multiple: true
           path: dist/
       - name: Publish to PyPI
         if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/')