feat(runtime): sys_info.rs - Use KERN_OSRELEASE on {Free,Open}BSD (#19849)

os_release() can use the same API as apple on FreeBSD and OpenBSD. Ports
for both systems contain a patch to that effect.

See:

https://github.com/freebsd/freebsd-ports/blob/main/www/deno/files/patch-runtime_ops_os_sys__info.rs

https://cvsweb.openbsd.org/ports/lang/deno/patches/patch-runtime_ops_os_sys_info_rs?rev=1.2

runtime/ops/os/sys_info.rs

@@ -57,7 +57,11 @@ pub fn os_release() -> String {
       _ => String::from(""),
     }
   }
-  #[cfg(target_vendor = "apple")]
+  #[cfg(any(
+    target_vendor = "apple",
+    target_os = "freebsd",
+    target_os = "openbsd"
+  ))]
   {
     let mut s = [0u8; 256];
     let mut mib = [libc::CTL_KERN, libc::KERN_OSRELEASE];