github/workflows: force deletion of existing symlinks with homebrew

This way each time a new Python version is installed via Homebrew
, we don't get CI failures due to the upstream Python distribution
also being installed.

Ref: actions/runner-images#6459
Ref: actions/runner-images#2322

.github/workflows/build.yml

@@ -78,7 +78,7 @@ jobs:
       - name: Install dependencies
         run: |
           brew update
-          brew install autoconf automake pkg-config libtool python freetype fribidi little-cms2 lua@5.1 libass ffmpeg meson
+          brew install --overwrite autoconf automake pkg-config libtool python freetype fribidi little-cms2 lua@5.1 libass ffmpeg meson
 
       - name: Build with meson
         run: |