ci: use stable homebrew

Change-Id: I5de36fbf7bbe33d45dae07e944dba9bd5e6ba170
Signed-off-by: Thomas Kosiewski <[email protected]>

Author: ThomasK33

.github/workflows/test.yml

@@ -23,6 +23,8 @@ jobs:
       - name: Set up Homebrew
         id: set-up-homebrew
         uses: Homebrew/actions/setup-homebrew@master
+        with:
+          stable: true
 
       - name: Cache Homebrew Bundler RubyGems
         id: cache