Workaround broken 'brew update' (#689)

* Workaround broken 'brew update'

See:

actions/runner-images#7855
Homebrew/homebrew-cask#150323

Author: lsh123

.github/workflows/make-check.yml

@@ -99,6 +99,9 @@ jobs:
           - config_flags: --enable-size-t=no
           - config_flags: --enable-md5
     steps:
+    - name: Set up Homebrew
+      id: set-up-homebrew
+      uses: Homebrew/actions/setup-homebrew@master      
     - name: install dependencies
       run: |
           brew update