Update deploy.yml to use download-artifact@v4

download-artifact@v2 has been deprecated.
https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Author: mcuee

.github/workflows/deploy.yml

@@ -56,7 +56,7 @@ jobs:
           - { arch: arm64 }
     steps:
       - name: Download artifact
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: avrdude-msvc-${{matrix.arch}}