[ci] Install missing macOS GHA pip3.11

Continuation of the saga: #250, #252, #257, #259.

Author: svenevs

.github/workflows/ci.yml

@@ -63,6 +63,9 @@ jobs:
           sudo rm -rf /Library/Frameworks/Python.framework/
           # Run upgrades now to fail-fast (setup scripts do this anyway).
           brew update && brew upgrade
+          # On 2023-02-16 the pip3.11 symlink was mysteriously missing.
+          brew link --overwrite [email protected]
+          pip3.11 --version
       - name: setup
         run: ./scripts/continuous_integration/github_actions/macos_monterey/setup
         shell: zsh -efuo pipefail {0}