Use AllowMmapWithoutExec instead of AllowMmap

PiperOrigin-RevId: 764142598
Change-Id: I53bdbabebd28ae621971a5202f0f3e6eb0344a01

Author: happyCoder92

sandboxed_api/sandbox2/policy_test.cc

@@ -218,7 +218,7 @@ PolicyBuilder PosixTimersPolicyBuilder() {
       .AllowDynamicStartup(sandbox2::MapExec())
       .AllowWrite()
       .AllowSyscall(__NR_getcwd)
-      .AllowMmap()
+      .AllowMmapWithoutExec()
       .AllowMlock()
       .AllowMkdir()
       .AllowGetIDs()