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] <[email protected]>

.github/workflows/benchmarks.yml

@@ -91,7 +91,7 @@ jobs:
       - {name: checkout, uses: actions/checkout@v3, with: {submodules: recursive, fetch-depth: 0}}
       - {name: install requirements, run: source .github/reqs.sh && c4_install_test_requirements $OS}
       - name: Download vars.sh
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with: {name: vars.sh, path: ./}
       - {name: show info, run: source .github/setenv.sh && c4_show_info}
       - name: Install python 3.10 for plotting
@@ -175,7 +175,7 @@ jobs:
     steps:
       - {name: checkout, uses: actions/checkout@v3, with: {submodules: recursive, fetch-depth: 0}}
       - name: Download vars.sh
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with: {name: vars.sh, path: ./}
       - name: test
         uses: uraimo/[email protected]

.github/workflows/release.yml

@@ -79,7 +79,7 @@ jobs:
     steps:
       - {name: checkout, uses: actions/checkout@v3, with: {submodules: recursive}}
       - name: Download vars.sh
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with: {name: vars.sh, path: ./}
       - name: Install python 3.9
         uses: actions/setup-python@v4
@@ -123,7 +123,7 @@ jobs:
     steps:
       - {name: checkout, uses: actions/checkout@v3, with: {submodules: recursive}}
       - name: Download vars.sh
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with: {name: vars.sh, path: ./}
       - {name: install requirements, run: source .github/reqs.sh && c4_install_test_requirements $OS}
       - {name: show info, run: source .github/setenv.sh && c4_show_info }
@@ -154,7 +154,7 @@ jobs:
     steps:
       - {name: checkout, uses: actions/checkout@v3, with: {submodules: recursive}}
       - name: Gather artifacts - ./assets
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with: {name: assets, path: assets}
       - name: Verify existing artifacts
         run: |
@@ -163,7 +163,7 @@ jobs:
       # Github
       - name: Restore vars.sh
         if: contains(github.ref, 'tags/v')
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with: {name: vars.sh, path: ./}
       - name: Save vars for following steps
         if: contains(github.ref, 'tags/v')