Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows (#9)

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
...

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Author: dependabot[bot]

.github/workflows/build_linux.yml

@@ -151,7 +151,7 @@ jobs:
         run: sudo apt-get update -m && sudo apt-get install -y libopenal-dev
 
       - name: download-artifacts
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: flex-linux
           path: .