CI: Remove Brew Cache (#479)

Too big to store.

.github/workflows/macos.yml

@@ -16,22 +16,8 @@ jobs:
       HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: TRUE
     steps:
     - uses: actions/checkout@v3
-    - name: Brew Cache
-      uses: actions/cache@v3
-      # - once stored under a key, they become immutable (even if local cache path content changes)
-      # - for a refresh the key has to change, e.g., hash of a tracked file in the key
-      with:
-        path: |
-          /usr/local/bin
-          /usr/local/lib
-          /usr/local/share
-          /Users/runner/Library/Caches/Homebrew
-        key: brew-macos-appleclang-${{ hashFiles('.github/workflows/macos.yml') }}
-        restore-keys: |
-          brew-macos-appleclang-
     - name: install dependencies
       run: |
-        brew --cache
         set +e
         brew unlink gcc
         brew update