Use the newer `bison` on GitHub actions macOS; ref #4903

`Windows-MinGW` and `Windows-VC` also requires updates.

.github/workflows/build.yml

@@ -54,10 +54,10 @@ jobs:
     - uses: actions/checkout@v1
     - name: brew
       run: brew install ruby gperf
-    - name: build
-      run: rake -m
-    - name: test
-      run: rake test
+    - name: build and test
+      run: rake -m -j4 all test
+      env:
+        MRUBY_TARGET: travis
 
   Windows-MinGW:
     runs-on: windows-latest