bump promoter

This version includes a cip-auditor version with fixes to logging [1] and
also child digest image detection [2].

[1]: kubernetes-sigs/promo-tools#206
[2]: kubernetes-sigs/promo-tools#199

k8s.gcr.io/images/k8s-staging-artifact-promoter/images.yaml

@@ -1,5 +1,6 @@
 - name: cip
   dmap:
+    "sha256:66d9e9329a088c28844aa8ebf16b9e46aa3af67f7e2bcf5046f7a57495f63b4a": ["20200328-v2.3.1-172-gfeb5dc0"]
     "sha256:3502b268065b125ad58977273b91092f5994a36f2deeac30d547fcaaebb34cd4": ["20200305-v2.3.1-117-gd677a55"]
     "sha256:1a36d74b30052783c986326f522e3b5688ea17c0cad851f9b1f265a67b67785b": ["20200222-v2.3.1-109-gb6af319"]
     "sha256:37f8e6c97408bee3f27ba3c664147cab9d98ef433cc65f7d8f7c68f0baea3a92": ["20200122-v2.3.1-79-gb737803"]
@@ -10,6 +11,7 @@
     "sha256:799f81d9a855717eab7198310655d1b55919320b120f0f015c3bb43c4e90316d": ["20190821-v2.2.1-2-gc29e4fc"]
 - name: cip-auditor
   dmap:
+    "sha256:7594278deaf6eeaa35caedec81796d103e3c83a26d7beab091a5d25a9ba6aa16": ["20200328-v2.3.1-172-gfeb5dc0"]
     "sha256:b2f4358e5764d037faed64a349e465d61e98693be3d348666eaf4ac3fb5bba1d": ["20200305-v2.3.1-117-gd677a55"]
     "sha256:5c9a73a90fdfd08adaf3d53ae863144922958911952dfa67cbf9a0d33dedde63": ["20200222-v2.3.1-109-gb6af319"]
     "sha256:fed92a03f4fa54db70605f5ea0889424a9f4aa6f5d88c175ba20c7f65a2ba72e": ["20200122-v2.3.1-79-gb737803"]