chore: upgrade upload/download-artifact to v4

.github/workflows/python-ci.yml

@@ -63,9 +63,9 @@ jobs:
 
       - name: Upload pytest test results
         if: ${{ always() }}
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
-          name: python-test-results
+          name: python-test-results-${{ matrix.os }}.py${{ matrix.python-version }}
           path: results/
 
   publish-test-results:
@@ -75,7 +75,7 @@ jobs:
 
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           path: artifacts
 
@@ -85,7 +85,7 @@ jobs:
       - name: Check Results Files Exist
         id: check-results-exist
         run: |
-          if [[ $(ls -l artifacts/python-test-results/*.xml 2> /dev/null | wc -l) -ge "1" ]]; then
+          if [[ $(ls -l artifacts/python-test-results-*/*.xml 2> /dev/null | wc -l) -ge "1" ]]; then
             exit 0
           else
             curl --request POST \