Bump actions/download-artifact from 5 to 6 (#105)

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -162,7 +162,7 @@ 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

@@ -100,7 +100,7 @@ jobs:
 
       # Fetch the built archives from the "build" job
       - name: Download built archives artifact
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: pypi-${{ github.sha }}
           path: dist

.github/workflows/test.yml

@@ -184,7 +184,7 @@ jobs:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-coverage
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           pattern: coverage_*
           # If true, the downloaded artifacts will be in the same directory