Update build.yml

Author: bnaras

.github/workflows/build.yml

@@ -35,14 +35,20 @@ jobs:
           - openblas
     steps:
       - uses: actions/checkout@v4
+
+      - name: Export gcc@13 environment variables
+        run: |
+          echo "CC=$(brew --prefix gcc@13)/bin/gcc-13" >> $GITHUB_ENV
+          echo "FC=$(brew --prefix gcc@13)/bin/gfortran-13" >> $GITHUB_ENV
+          echo "LIBRARY_PATH=$(brew --prefix gcc@13)/lib/gcc/13" >> $GITHUB_ENV
+
       - uses: ructions/toolchain@v2
-        with: {toolchain: stable}
-      - run: cargo test --features=${{ matrix.feature }}
-        env:
-          CC: gcc-12
-          FC: gfortran-12
-          LIBRARY_PATH: /usr/local/opt/gcc@12/lib/gcc/12
+        with:
+          toolchain: stable
 
+      - name: Run tests
+        run: cargo test --features=${{ matrix.feature }}
+    
   test-ubuntu:
     runs-on: ubuntu-latest
     strategy: