Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

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

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

.github/workflows/ci-workflow.yml

@@ -53,13 +53,13 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Download Bitcoin app binary
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: bitcoin-app
           path: tests/bitcoin-bin
 
       - name: Download Bitcoin Testnet app binary
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: bitcoin-testnet-app
           path: tests/bitcoin-testnet-bin