Bump actions/download-artifact from 5 to 6 (#590)

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -153,7 +153,7 @@ jobs:
 
       # Fetch the built docs from the "build" job
       - name: Download HTML documentation artifact
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: docs-${{ github.sha }}
           path: doc/_build/html

.github/workflows/pypi.yml

@@ -107,7 +107,7 @@ jobs:
           persist-credentials: false
 
       - name: Download built source and wheel packages
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: pypi-${{ github.sha }}
           path: dist

.github/workflows/test.yml

@@ -181,7 +181,7 @@ jobs:
         # Maximum coverage is achieved by combining reports from every runner.
         # Each coverage file will live in its own folder with the same name as
         # the artifact.
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: coverage_*