Tolerate non-fatal errors for mpv install.

.github/workflows/main.yml

@@ -20,8 +20,7 @@ jobs:
     - name: Install dependencies
       run: |
         brew update
-        rm /usr/local/bin/2to3-3.11
-        brew install ninja mpv
+        brew install ninja mpv || true
     - name: Release build
       run: |
         ./download_webclient.sh