Use the setup-fortran action from fortran-lang on MacOS

.github/workflows/ci.yml

@@ -192,10 +192,10 @@ jobs:
       - name: Install system dependencies
         run: brew install cairo mariadb-connector-c openssl@1.1 coreutils gnu-sed r
       - name: Setup gfortran
-        run: |
-          sudo ln -s /usr/local/bin/gfortran-11 /usr/local/bin/gfortran
-          sudo mkdir /usr/local/gfortran
-          sudo ln -s /usr/local/Cellar/gcc@11/11.3.0_1/lib/gcc/11 /usr/local/gfortran/lib
+        uses: fortran-lang/setup-fortran@v1
+        with:
+          compiler: gcc
+          version: 12
       - name: Setup pandoc 
         uses: r-lib/actions/setup-pandoc@v1
       - name: Get NONMEM