Update upload and download artifact actions

Author: robbievanleeuwen

.github/workflows/tests.yml

@@ -112,14 +112,15 @@ jobs:
 
       - name: Upload coverage data
         if: always() && matrix.session == 'tests'
-        uses: "actions/upload-artifact@v3"
+        uses: actions/upload-artifact@v4
         with:
-          name: coverage-data
+          name: coverage-data-${{ matrix.os }}-${{ matrix.python }}
+          include-hidden-files: true
           path: ".coverage.*"
 
       - name: Upload documentation
         if: matrix.session == 'docs-build'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: docs
           path: docs/_build
@@ -153,9 +154,11 @@ jobs:
           nox --version
 
       - name: Download coverage data
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: coverage-data
+          pattern: coverage-data-*
+          merge-multiple: true
 
       - name: Combine coverage data and display human readable report
         run: |
@@ -166,6 +169,6 @@ jobs:
           nox --session=coverage -- xml -i
 
       - name: Upload coverage report
-        uses: codecov/codecov-action@v4.5.0
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}