Changed macports installation

.github/workflows/build.yml

@@ -40,12 +40,15 @@ jobs:
         run: cargo build --workspace --examples --verbose
 
   build-macos:
-    runs-on: macOS-10.14
+    runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
         with:
           submodules: 'true'
-      - uses: keepitsimpletech/actions/setup-macports@setup-macports/releases/v1
+      - name: install macports
+        run: |
+          curl -LO https://raw.githubusercontent.com/GiovanniBussi/macports-ci/master/macports-ci
+          source ./macports-ci install
       - name: install libusb-1.0
         run: sudo port -vs install libusb libusb-devel
       - name: build