set open file limits

tools/internal_ci/helper_scripts/prepare_build_macos_rc

@@ -30,7 +30,12 @@
 
 # Source this rc script to prepare the environment for macos builds
 
-ulimit -n 1000
+sudo launchctl limit maxfiles unlimited unlimited
+
+# show current maxfiles
+launchctl limit maxfiles
+
+ulimit -n 10000
 
 # show current limits
 ulimit -a