Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/slycot-build-and-test.yml

@@ -192,7 +192,7 @@ jobs:
       - name: Checkout Slycot
         uses: actions/checkout@v3
       - name: Download wheels (if any)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: slycot-wheels
           path: slycot-wheels
@@ -210,7 +210,7 @@ jobs:
       - name: Checkout Slycot
         uses: actions/checkout@v3
       - name: Download conda packages
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: slycot-conda-pkgs
           path: slycot-conda-pkgs
@@ -272,7 +272,7 @@ jobs:
               exit 1 ;;
           esac
       - name: Download wheels
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: slycot-wheels
           path: slycot-wheels
@@ -331,7 +331,7 @@ jobs:
           channel-priority: strict
           auto-activate-base: false
       - name: Download conda packages
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: slycot-conda-pkgs
           path: slycot-conda-pkgs