update cache key from linux apt, so no arm / x86 packages mixed

Author: dimitre

.github/workflows/of.yml

@@ -60,7 +60,7 @@ jobs:
             libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev gstreamer1.0-pulseaudio
             gstreamer1.0-x gstreamer1.0-plugins-bad gstreamer1.0-alsa
             gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-libav
-          version: 1.0
+          version: 1.0-${{ matrix.platform }}
 
       - name: Cache Packages - macOS Brew
         if: runner.os == 'macOS'