Fixed OSX builds

Author: JohanMabille

.azure-pipelines/azure-pipelines-osx.yml

@@ -3,10 +3,10 @@ jobs:
     strategy:
       matrix:
         macOS_10_14:
-          image_name: 'macOS-10.14'
+          image_name: macOS-11
           blas: 'mkl'
         macOS_10_15:
-          image_name: 'macOS-10.15'
+          image_name: macOS-12
           blas: 'mkl'
     pool:
       vmImage: $(image_name)
@@ -17,9 +17,7 @@ jobs:
     steps:
       - script: |
           echo "Removing homebrew for Azure to avoid conflicts with conda"
-          curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall > ~/uninstall_homebrew
-          chmod +x ~/uninstall_homebrew
-          ~/uninstall_homebrew -f -q
+          /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)"
         displayName: Remove homebrew
 
       - bash: |