Try to reset Brew.

The `brew update` in the workflow failed with "Error: Fetching
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core failed!"

changing to `brew update-reset` (from the docs - "last effort to fix a
problem").

Author: zivy

.github/workflows/main.yml

@@ -72,7 +72,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install enchant-2
         elif [ "$RUNNER_OS" == "macOS" ]; then
-          brew update
+          brew update-reset
           brew install enchant
         fi
     - name: Install dependencies