fix(dev): Avoid flakey `brew update` in development-environment workflow (#33832)

.github/workflows/development-environment.yml

@@ -89,10 +89,9 @@ jobs:
       - name: Checkout sentry
         uses: actions/checkout@v2
 
-      # We update brew because we need a newer version of pyenv which has access to 3.8.13
       - name: Install pyenv
         run: |
-          brew update && brew install pyenv
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install pyenv
 
       # Only after we source ~/.zprofile that the right Python will be selected
       - name: Set up pyenv