Add pch=off to b2-windows-arm64 test phase

.github/workflows/ci.yml

@@ -423,7 +423,7 @@ jobs:
       - name: Test Boost
         run: |
           cd status
-          ../b2 -j3 quick
+          ../b2 -j3 pch=off quick
 
   # Win Arm64 CMake job
   cmake-install-windows-arm64: