Update CI

Author: alxbilger

.github/workflows/ci.yml

@@ -12,13 +12,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-10.15, windows-2019]
-        sofa_branch: [master, v21.12]
+        os: [ubuntu-20.04, macos-11, windows-2019]
+        sofa_branch: [master]
 
     steps:
       - name: Setup SOFA and environment
         id: sofa
-        uses: sofa-framework/sofa-setup-action@v3.0
+        uses: sofa-framework/sofa-setup-action@v4
         with:
           sofa_root: ${{ github.workspace }}/sofa
           sofa_version: ${{ matrix.sofa_branch }}