Revert "Bump actions to node 20 (#3461)" (#3462)

This reverts commit defeb8e52b.

As per https://github.com/actions/upload-artifact/issues/478 the new version of upload-artifact includes a breaking change.

.github/workflows/package_raspbian.yml

@@ -17,7 +17,7 @@ jobs:
     needs: build-raspbian
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
         with:
           submodules: recursive
           ref: ${{github.event.pull_request.head.ref}}
@@ -66,7 +66,7 @@ jobs:
           depends: libyaml-cpp0.7, openssl
           desc: Native Linux Meshtastic binary.
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         with:
           name: artifact-deb
           path: |