Switch to upload-artifact/download-artifact v4

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
     - run: nox -e ${{ matrix.task.nox }}
 
     - name: Publish
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: dist
         path: dist/
@@ -84,7 +84,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Download package files
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: dist
         path: dist/
@@ -104,9 +104,9 @@ jobs:
     - run: nox --python ${{ matrix.python.action }} -e ${{ matrix.task.nox }} -- --use-wheel dist/*.whl
 
     - name: Upload coverage data
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
-        name: coverage-data
+        name: coverage-data-${{ matrix.python.action }}
         path: .coverage.*
         include-hidden-files: true
         if-no-files-found: ignore
@@ -131,7 +131,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Download package files
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: dist
         path: dist/
@@ -178,7 +178,7 @@ jobs:
         fetch-depth: 0
 
     - name: Download package files
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: dist
         path: dist/
@@ -246,7 +246,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Download package files
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: dist
         path: dist/
@@ -283,9 +283,11 @@ jobs:
 
     - run: python -Im pip install --upgrade coverage[toml]
 
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
-        name: coverage-data
+        pattern: coverage-data-*
+        merge-multiple: true
+        path: .
 
     - name: Combine coverage & fail if it's <100%.
       run: |
@@ -299,10 +301,11 @@ jobs:
         python -Im coverage report --fail-under=100
 
     - name: Upload HTML report if check failed.
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: html-report
         path: htmlcov
+        include-hidden-files: true
       if: ${{ failure() }}
 
   # This is a meta-job to simplify PR CI enforcement configuration in GitHub.