Remove the most of arm from the list for macOS

To save the CI resources.

I left arm-13 as it used to have macOS-specific build issues.
apache/nuttx-apps#156

Author: yamt

.github/workflows/build.yml

@@ -71,7 +71,7 @@ jobs:
 
     strategy:
       matrix:
-        boards: [arm-01, arm-02, arm-03, arm-04, arm-05, arm-06, arm-07, arm-08, arm-09, arm-10, arm-11, arm-12, arm-13, mips-riscv-x86-xtensa, sim]
+        boards: [arm-13, mips-riscv-x86-xtensa, sim]
 
     steps:
     - name: Checkout nuttx repo