Uninstall cmake before installing

Uninstall cmake before installing dependencies.

Author: cxzhong

.github/workflows/ci-macos.yml

@@ -52,6 +52,7 @@ jobs:
 
       - name: Install dependencies
         run: |
+          brew uninstall --force cmake || true
           eval $(build/bin/sage-print-system-package-command homebrew update)
           eval $(build/bin/sage-print-system-package-command homebrew --yes --ignore-missing install $(build/bin/sage-get-system-packages homebrew _bootstrap _prereq $(build/bin/sage-package list :standard:)))
 
@@ -68,4 +69,4 @@ jobs:
         run: |
           source ./.homebrew-build-env # Needed so that runtime cython can find the dependencies
           ./sage -t --all -p4
-    
+