Update process submodule to 1.2.3.0 snapshot

This fixes the compilation failure

  libraries\process\System\Process\Internals.hs:36:5:
      Not in scope: `stopDelegateControlC'
      ...

(however, GHC HEAD skipped process-1.2.2 which has that issue)

process @ 160bdd16

-Subproject commit 1a62f86e77118520143985d9baf62d31a9d1c748
+Subproject commit 160bdd16722d85c2644bd2353121d8eb5e1597e4